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pen sb in/up

phrasal verb with pen
 
 
/pen/ verb [T] (-nn-) formal

Definition

to keep people or animals in a small area: The sheep were penned in behind the barn. The soldiers were penned up in their barracks.Putting people in prisonAnimal farming - general words
(Definition of pen sb in/up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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