Short answer: an eggcorn is a word or phrase that someone has misheard and rebuilt into something that still makes sense. The name comes from "egg corn" for "acorn": an acorn is roughly egg-shaped and it is a seed, so the mistake has its own logic. Common eggcorn examples include "for all intensive purposes" (for "intents and purposes"), "baited breath" (for "bated breath") and "free reign" (for "free rein"). A malapropism swaps in a real word that makes no sense; a mondegreen is a mishearing, often of song lyrics, that need not make sense at all. The eggcorn is the one that sounds right.
Where the word "eggcorn" came from
Unusually for a word about language, "eggcorn" has a documented birth date, and it happened online.
Wikipedia's article on the term, citing the original posts, says it was coined in September 2003 by the linguist Geoffrey Pullum in response to a post by Mark Liberman on the linguistics blog Language Log. Liberman had written about a woman who spelled "acorn" as "egg corn," and noted that the error did not fit any existing label. It was a bit like a folk etymology, a bit like a mondegreen and a bit like a malapropism, but it was not exactly any of them. Pullum suggested using the example itself as the name, the same way "mondegreen" is named after its own famous mishearing.
Liberman confirmed the date in a later post. In "Eggcorn makes it into Merriam-Webster", posted on Language Log on May 30, 2015 (read September 25, 2026), he says the term was first suggested in a post titled "Egg corns: Folk Etymology, Malapropism, Mondegreen, ???" dated September 23, 2003. The same post records that "eggcorn" entered the Oxford English Dictionary in 2010, the American Heritage Dictionary in 2011, and Merriam-Webster in 2015. A word for a kind of mistake went from a blog discussion to three major dictionaries in about twelve years.
Liberman's post also points readers to the Eggcorn Database, a collection of examples compiled by Chris Waigl.
What makes something an eggcorn
The test is simple once you see it. According to Wikipedia's article on eggcorns (read September 25, 2026), an eggcorn is "the alteration of a word or phrase through the mishearing or reinterpretation of one or more of its elements," producing a new phrase that is "plausible when used in the same context."
That gives three conditions:
- It sounds almost the same as the original, often identical in ordinary speech.
- It uses a real word or words, not nonsense.
- It still makes sense, sometimes more sense to a modern speaker than the original, because the original contains an old or unfamiliar word.
Condition 3 is the heart of it. "Bated breath" uses "bate," which the Online Etymology Dictionary describes as a shortening of "abate" that now survives only in this phrase. "Baited breath" uses "bait," which everyone knows, and a reader can build a story around it: waiting like a fish near a hook. The error is not random. It is the brain repairing a phrase it only half understands.
Eggcorn vs malapropism vs mondegreen vs folk etymology
These four terms overlap, and even the references describe the borders slightly differently. Here is the working distinction, drawn from the Wikipedia articles on each term:
| Term | What happens | Does the result make sense? | Named after | Example |
|---|---|---|---|---|
| Eggcorn | A word or phrase is misheard and rebuilt with familiar words | Yes, plausibly | "egg corn" for "acorn" (Language Log, 2003) | "for all intensive purposes" |
| Malapropism | A real word is swapped for a similar-sounding one | No, usually comic | Mrs. Malaprop in Richard Brinsley Sheridan's The Rivals (1775) | "the use of my oracular tongue" for "vernacular" |
| Mondegreen | A phrase, often a lyric or poem, is misheard | Not necessarily | Sylvia Wright's "Lady Mondegreen," Harper's Magazine, 1954 | "and Lady Mondegreen" for "and laid him on the green" |
| Folk etymology | A mistaken form spreads until the whole community uses it | Yes | Descriptive term | "Jerusalem artichoke," from Italian girasole, the example Liberman gave in 2003 |
A few notes on the borders:
- Malapropism. Wikipedia says Sheridan named Mrs. Malaprop after the French mal à propos, "inappropriate." Her line "if I reprehend any thing in this world it is the use of my oracular tongue" should read "apprehend" and "vernacular." The humor comes from the result being absurd. An eggcorn is not absurd.
- Mondegreen. Wright explained in 1954 that as a child she heard the Scottish ballad line "They hae slain the Earl o' Moray / And laid him on the green" as naming a second victim, "Lady Mondegreen." A mondegreen can be pure nonsense, which an eggcorn cannot.
- Folk etymology. Wikipedia's article on eggcorns draws the line by scale: a folk etymology has changed the word for a whole speech community, while an eggcorn may belong to individual speakers. An eggcorn that everyone adopts can become a folk etymology.
Ten eggcorn examples, and why each one makes sense
Most lists of eggcorn examples just set the wrong form next to the right one. The useful part is the "why": what familiar word replaced the unfamiliar one, and what new logic it creates. Examples 1, 2 and 10 are given as eggcorns by Wikipedia or Language Log. The others are our own application of the three-part test above to phrases covered on this site, so treat the last column as analysis, not dictionary labeling.
| # | Eggcorn | Standard form | The unfamiliar word | Why the eggcorn sounds logical |
|---|---|---|---|---|
| 1 | for all intensive purposes | for all intents and purposes | the paired nouns "intents and purposes" | "intensive" sounds like emphasis, which fits "for every purpose" |
| 2 | baited breath | bated breath | "bate," a clipped form of "abate" | pictures holding your breath like bait waiting for a bite |
| 3 | free reign | free rein | "rein," from horse tack | a ruler "reigns" freely, which also suggests no restriction |
| 4 | tow the line | toe the line | "toe" as a verb | "towing" suggests pulling along with the group |
| 5 | slight of hand | sleight of hand | "sleight," meaning dexterity or trickery | a trick is a "slight" movement of the hand |
| 6 | nip it in the butt | nip it in the bud | "bud," from gardening | "nip in the butt" sounds like a quick bite that stops something |
| 7 | beckon call | beck and call | "beck," an old word for a gesture | "beckon" means to summon, so "beckon call" seems exact |
| 8 | wreck havoc | wreak havoc | "wreak," a verb now rarely used outside this phrase | havoc is wreckage, so "wreck" seems to fit |
| 9 | on tenderhooks | on tenterhooks | "tenter," a cloth-stretching frame | anxiety feels "tender," and hooks sound painful |
| 10 | egg corn | acorn | the word "acorn" itself | an acorn is egg-shaped and it is a seed, like a grain of corn |
Notice the pattern in the fourth column. Almost every eggcorn replaces a word that has fallen out of general use (beck, bate, tenter, wreak, sleight) or a technical sense most people never learned (rein, bud). The eggcorn is what happens when a phrase outlives the vocabulary it was built from.
Our guide to commonly misused idioms and why the errors are predictable groups these by error type, and sound-alike swaps like these make up one of the largest groups.
Borderline cases: when an eggcorn wins
Some phrases sit on the line between eggcorn and accepted variant, because enough people used the "wrong" form that dictionaries began to list it.
"Hone in" is the classic case. The original is "home in," from a homing pigeon or missile finding its target. "Hone" means to sharpen, and "honing in" on a problem feels like sharpening your focus, which is textbook eggcorn logic. Our page on hone in vs home in shows how a major dictionary and a usage guide now disagree about whether it is still an error.
"Champing at the bit" and "chomping at the bit" are another example. Grammarist says "champing" came first but that both forms are now technically correct and "chomping" is widely accepted.
This is how language changes. An eggcorn starts as one person's reasonable guess. If enough people make the same guess, it becomes a variant. If nearly everyone does, it becomes the standard form, and the original starts to look like the mistake.
Should you correct an eggcorn?
It depends on where it appears.
- In your own formal writing: yes. Readers who know the standard form will notice, and in business or academic writing the eggcorn can undercut your credibility even though the logic behind it is sound.
- In someone else's speech: usually not. Most eggcorns are invisible in conversation, because they sound the same.
- When teaching or editing: explain the logic. Telling a writer that "bated" is related to "abate" is more memorable than a bare correction.
- For learners of English: eggcorns are a good sign. They show the speaker is trying to make sense of a phrase rather than just memorizing it.
Eggcorns are also a useful reminder about origins. Many phrases survive long after the object or trade that produced them disappeared, which is why so many stories about where idioms come from are guesses. Our explainer on where idioms come from and how a phrase origin is traced shows how references separate a documented origin from a plausible-sounding one.
Frequently asked questions
What is an eggcorn?
An eggcorn is a misheard word or phrase that has been rebuilt with familiar words and still makes sense, such as "baited breath" for "bated breath." The term comes from "egg corn," a misspelling of "acorn."
Who coined the word "eggcorn"?
The linguist Geoffrey Pullum suggested it in September 2003, in response to a Language Log post by Mark Liberman about someone who wrote "egg corn" for "acorn." According to Liberman, the word entered the Oxford English Dictionary in 2010 and Merriam-Webster in 2015.
What is the difference between an eggcorn and a malapropism?
A malapropism swaps in a real word that makes no sense in context, usually with a comic result. An eggcorn produces a phrase that still makes sense. The malapropism is named after Mrs. Malaprop in Sheridan's 1775 play The Rivals.
What is the difference between an eggcorn and a mondegreen?
A mondegreen is a mishearing, often of song lyrics or poetry, and the result need not make sense. An eggcorn must stay plausible in context. The word "mondegreen" comes from Sylvia Wright's 1954 essay in Harper's Magazine.
Is "for all intensive purposes" an eggcorn?
Yes. Wikipedia's article on eggcorns lists it as an example. The standard form is "for all intents and purposes."
