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idioms involving flag
A red flag
A warning signal
The sudden drop in sales was a red flag that we shouldn't have ignored.
The sales of our top brand are flagging so we must increase the advertising budget.
Signal, get the attention of
Please see if you can flag down a taxi while I finish locking up the office.
A very patriotic person
The flag wavers were marching to show their support for the troops.
Run something up the flagpole
To mention an idea to assess the reaction
I like your idea, Higuchi-san. Let's run it up the flagpole in next Tuesday's meeting and see if it flies.