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can't

/kænt/

Is not able or not permitted to

From Proto-Indo-European → Proto-Germanic → Old English can (Know how) + Modern English n't (Not).

verb
can
Proto-Indo-European
*ǵneh₃-
“to know”; the distant source of knowing and ability
Proto-Germanic
*kunnaną
“to know how, be mentally able”
Old English
can(n), from cunnan
First- and third-person singular present; “know how, be able”
Modern English
can
Modal auxiliary expressing ability, possibility, or permission
n't
Modern English contraction
n't
Reduced form of not, attached to an auxiliary
Modern English
cannot → can't
Negates can: inability, impossibility, or lack of permission
Combined
cannot → can't
The modal can combines with the negative not and contracts in ordinary speech and writing.
English, 1650s onward
can't
Recorded as a contraction of cannot; Wiktionary records it from 1706 or earlier
Modern English
can't
Used for inability, prohibition, and sometimes emphatic refusal
Modern English
can't
“

At first, can was less about physical power than about knowledge: in Old English, cunnan meant “to know how,” as in possessing a skill lodged in the mind. That same ancient family eventually produced know, cunning, and even couth—so when someone is uncouth, the word’s buried history says they are “not known” or not familiar in the proper social way. English speakers began welding can to not, producing cannot and then the brisker can't; the contraction is recorded by the 1650s and appears in Wiktionary’s record from 1706 or earlier. The result can describe inability (“I can’t swim”), prohibition (“You can’t enter”), or simple refusal (“I can’t”), compressing an entire judgment into one clipped syllable. Remember it as a tiny locked door: can supplies the ability, not supplies the barrier, and the apostrophe marks where the two collided.

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