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English definition of “break in someone/something”

break in someone/something

verb phrasal verb with break  /breɪk/ us  

(TRAIN)

to train a person to do a new job, to train an animal to behave in an obedient way, or to use something to make it not as new and more comfortable: We will have to break in three new staff members. I’m still breaking in this new pair of running shoes.
(Definition of break in someone/something from the Cambridge Academic Content Dictionary © Cambridge University Press)
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