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don't

/doʊnt/; /dəʊnt/

Contraction meaning “do not” or “does not”

From Proto-Indo-European via Proto-Germanic and Old English do (to put) + English n't (contracted negative marker from not).

noun
interjection
do
Proto-Indo-European
*dʰeh₁-
“to put, place, do, make”
Proto-Germanic
*dōną
“to do, make, put”
Old English
dōn
“to make, act, perform, cause; put or place”
Middle English
do
Verb meaning “perform, carry out”; later develops auxiliary uses
n't
English
not
Negative adverb; contracted in combination with auxiliary verbs
Combined
do not → don't
English phonetic contraction elides the vowel of not and attaches its reduced form -n't to do; the spelling don't is recorded in plays from the 1630s.
Early Modern English
don't
Written contraction of do not; in Elizabethan plays, some instances may instead represent contracted done it.
Modern English
don't
Usually “do not”; in many dialects also used for third-person singular “does not.”
Modern English
don't

English spent centuries making the verb do carry more and more luggage: first “put” or “make,” then “perform,” and eventually the nearly empty helper in questions and negatives. Its oldest trail leads back to the Proto-Indo-European root *dʰeh₁-, “to put,” a tiny linguistic brick also hiding behind relatives such as deed, theme, and thesis. By the 1630s, playwrights were writing do not as don’t, although Elizabethan spelling creates a delightful trap: some examples may actually be compressed done it. The contraction became especially useful once English required do as a grammatical support in negatives—“I do not know”—rather than relying on the older negative particles of Old English. And in many dialects, don’t even stands in for “does not,” showing that spoken English is perfectly willing to flatten grammar when a quick syllable will do the job.

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