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English definition of “wear thin”

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wear thin

informal
C2 If your patience wears thin, you become less and less patient: I've warned you several times about being late and my patience is wearing thin. C2 If something such as a joke wears thin, it becomes boring or annoying or stops being funny or effective, because it has been seen, heard, or used too much: Tony, the joke is beginning to wear thin now and a lot of us have had enough. Her standard excuse for being late was beginning to wear thin.
(Definition of wear thin from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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