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English definition of “dim”

dim

verb [I or T]     /dɪm/ (-mm-)
C2 to (make something) become less bright : Someone dimmed the lights . The lights dimmed and the curtains opened .Darkness and becoming dark literary to (make a positive feeling or quality ) become less strong : Our hopes / expectations dimmed as the hours passed .Becoming and making less strong
(Definition of dim verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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