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get/muscle in on the act

informal

Definition

to take advantage of something that someone else started: We did all the hard work of setting up the company, and now everyone wants to get in on the act.Using and misusingGetting involved for one's own benefit or against others' willTaking part and getting involved
(Definition of get/muscle in on the act from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)