run sth in definition, meaning - what is run sth in in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “run sth in”

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run sth in

UK (US break sth in)
phrasal verb with run uk   us   /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.
(Definition of run sth in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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