Meaning of “break in someone/something” in the English Dictionary

american-english dictionary

"break in someone/something" in American English

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break in someone/something

phrasal verb with break us /breɪk/ verb

(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)