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English definition of “put up or shut up”

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put up or shut up

informal
If you say someone should put up or shut up, you mean that they should either take action in order to do what they have been talking about, or stop talking about it: You keep saying you're going to ask her out. Well, put up or shut up.
(Definition of put up or shut up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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