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flag

verb [I] (BECOME TIRED)
 
 
/flæɡ/ (-gg-)

Definition

to become tired, weaker, or less effective: I was starting to flag after the ninth mile. The conversation was flagging.Tired and making tiredBecoming and making less strong
(Definition of flag verb (BECOME TIRED) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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