A fossil word is a word that is broadly but remains in use due to its presence in an idiom or phrase. An example of a word is 'ado' in 'much ado'. An example of a phrase is (relevant), which is found in the phrases (or 'case on point' in the legal context) and '', but is rarely used outside of a legal context.
English-language examples
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ado, as in "" or "" or "", although the homologous form "to-do" remains attested ("make a to-do", "a big to-do", etc.)
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amok, as in "run amok"
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asunder, as in "torn asunder"
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bandy, as in "" or ""
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bated, as in "", although the derived term "abate" remains in non-idiom-specific use
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beck, as in "", although the verb form "beckon" is still used in non-idiom-specific use
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betide, as in "woe betide you/us/them"
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bide, as in "bide your time"
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champing, as in "", where "champ" is an obsolete precursor to "chomp", in current use
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coign, as in ""
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deserts, as in "", although singular "desert" in the sense of "state of deserving" occurs in nonidiom-specific contexts including law and philosophy. "Dessert" is a French loanword, meaning "removing what has been served," and has only a distant etymological connection.
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dint, as in ""
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dudgeon, as in ""
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eke, as in ""
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fettle, as in "",
[Quinion, Michael. World Wide Words] although the verb, 'to fettle', remains in specialized use in metal casting.
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fro, as in ""
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goodly, as in "goodly number"
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helter skelter, as in "scattered about the office", Middle English skelten to hasten
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inclement, as in "inclement weather”
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jetsam, as in "", except in legal contexts (especially admiralty, property, and international law)
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kith, as in ""
[ Yahoo dictionary kith and kin]
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lam, as in “on the lam”
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lo, as in ""
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loggerheads as in ""
[ Phrase Finder at loggerheads] or loggerhead turtle
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madding as in "far from the madding crowd"
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math, as in ""
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muchness as in ""
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ne'er, as in ""
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scot, as in ""
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sleight, as in ""
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shebang, as in "", although the word is now used as an unrelated common noun in programmers' jargon.
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shrive, preserved only in inflected forms occurring only as part of fixed phrases: 'shrift' in ""
and 'shrove' in "Shrove Tuesday"
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span and spick, as in ""
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turpitude, as in ""
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vim, as in "", though preserved as the name of a scouring powder
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wedlock, as in ""
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wend, as in "wend your way",
although its former past tense "went" is still in use as the past tense of "to go"
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wreak, as in "wreak havoc"
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yore, as in "", usually "days of yore"
"Born fossils"
These words were formed from other languages, by elision, or by mincing of other fixed phrases.
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caboodle, as in "" (evolved from "kit and boodle", itself a fixed phrase borrowed as a unit from Dutch kitte en boedel)
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druthers, as in "" (formed by elision from "would rather"
and never occurring outside this phrase to begin with)
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tarnation, as in "" (evolved in the context of fixed phrases formed by minced oath of previously fixed phrases that include the term "damnation")
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nother, as in "" (fixed phrase formed by rebracketing another as a nother, then inserting whole for emphasis; almost never occurs outside this phrase)
See also
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Bound morpheme
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Collocation — tendency of one word to occur near another
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Cranberry morpheme — morpheme which has no independent meaning in a lexeme
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Fossilization (linguistics)
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Irreversible binomial