Question 1

What does "flag down" mean?

Accepted Answer

To signal a driver or vehicle to stop, usually by waving one's hand or arm.

Question 2

How do you use "flag down" in a sentence?

Accepted Answer

She ran to the edge of the road and managed to flag down a passing taxi.

Question 3

Is "flag down" formal or informal?

Accepted Answer

"flag down" is register-neutral — appropriate in both casual and formal contexts. Very common in everyday speech. Used for taxis, passing cars, buses, and other vehicles. Often seen in news reports describing police stopping vehicles. 'Flag down a cab' is a very common collocation.

flag down

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