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English definition of “flag sth/sb down”

flag sth/sb down

phrasal verb with flag     /flæɡ/ verb (-gg-)
to cause a vehicle to stop by waving at its driver : I managed to flag down a passing police car .Gestures with the hands or arms
(Definition of flag sth/sb down from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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