Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: Origin unknown

flag

2 verb
     
flag2 past tense and past participle flagged, present participle flagging
1 [transitive] to make a mark against some information to show that it is important:
I've flagged the parts I want to comment on.
2 [intransitive] to become tired or weak:
By the end of the meeting we had begun to flag.

flag somebody/something ↔ down

phrasal verb
to make the driver of a vehicle stop by waving at them:
I flagged down a taxi.

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