When you disallow something, you prohibit it. Teachers usually disallow cell phones in their classrooms.

You're most likely to come across the verb disallow in official or formal contexts, like a list of rules in a courtroom or within the wording of a law. Referees often disallow certain actions in sports matches, and prison wardens disallow many kinds of behavior by prisoners. The word comes from allow, with its root allouen, "to praise, approve of, or be pleased with," with the Latin prefix dis in front, here meaning "do the opposite of."

Definitions of disallow

v command against

forbid, interdict, nix, prohibit, proscribe, veto
allow, countenance, let, permit
consent to, give permission
allow, grant
let have
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prohibit especially by legal means or social pressure
bar, debar, exclude
prevent from entering; keep out
issue an injunction
criminalise, criminalize, illegalise, illegalize, outlaw
declare illegal; outlaw
ban, censor
forbid the public distribution of ( a movie or a newspaper)
Type of:
command, require
make someone do something

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