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English definition of “run sth in”

run sth in

UK (US break sth in) phrasal verb with run     /rʌn/ verb (present participle running, past tense ran, past participle run)
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 .Using and misusing
(Definition of run sth in from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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