Definition of shut / in phrasal verb from the Oxford Advanced American Dictionary

 

shut / in

 phrasal verb
phrasal verb
 
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Phrasal Verbs

shut somebody/yourself in (something)

 
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to put someone in a room and keep them there; to go to a room and stay there She shut the dog in the shed while she prepared the barbecue.
See the Oxford Advanced Learner's Dictionary entry: shut / in