Meaning of “impair” in the English Dictionary

"impair" in British English

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(Definition of “impair” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"impair" in American English

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impairverb [ T ]

us /ɪmˈpeər/

to damage or weaken something so that it is less effective:

Lack of sleep impaired her ability to think clearly.
impairment
noun [ C/U ] us /ɪmˈpeər·mənt/

[ C ] The law bans discrimination against anyone with a mental or physical impairment.

(Definition of “impair” from the Cambridge Academic Content Dictionary © Cambridge University Press)