flag down

1. 1.

   signal to stop

   “Let's flag down a cab--it's starting to rain”

   “The policeman flagged down our car”

   Broaderstop

Questions about flag down

What does flag down mean?

flag down means "signal to stop".

Is flag down a common word?

flag down is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.