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English definition of “break sth in”

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break sth in

verb uk phrasal verb with break   /breɪk/ (broke, broken) us  
to wear new shoes or use new equipment for short periods to make them more comfortable: My new hiking boots will be great once I've broken them in. US ( UK run sth in) If you break in a vehicle, you use it carefully and slowly for a short time when it is new, so that you do not damage its engine.
(Definition of break sth in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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