Definition of muscle in phrasal verb from the Oxford Advanced Learner's Dictionary

 

muscle in

 phrasal verb
phrasal verb
 
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Phrasal Verbs

muscle in

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muscle in on somebody

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muscle in on something

 
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(informal, disapproving) to involve yourself in a situation when you have no right to do so, in order to get something for yourself
See the Oxford Advanced American Dictionary entry: muscle in