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English definition of “run down something”

run down something

verb phrasal verb with run  /rʌn/ (present participle running, past tense ran  /ræn/, past participle run) us  

(FIND)

to learn the facts about something after searching for them: The police are running down several leads related to the crime.
(Definition of run down something phrasal verb, verb from the Cambridge Academic Content Dictionary © Cambridge University Press)
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