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OAT→impair

impair

Flag: gbEnglishOxford American Thesaurus
impair
verb
even one drink can impair driving performance:
damage, harm, diminish, reduce, weaken, lessen, decrease, blunt, impede, hinder, mar, spoil, disable;
undermine, compromise, threaten;
informal foul up, put the kibosh on;
rare vitiate.
▷antonyms improve, enhance.