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English definition of “run sth in”

run sth in

UK (US break sth in)
verb uk phrasal verb with run   /rʌn/ (present participle running, past tense ran, past participle run) us  
If you run 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 run sth in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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