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English definition of “flag sth/sb down”

flag sth/sb down

verb uk phrasal verb with flag   /flæɡ/ (-gg-) us  
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 Learners Dictionary & Thesaurus © Cambridge University Press)
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