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flag down

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Signal to stop, as in The police were flagging down all cars. This expression uses the verb flag in the sense of “catch the attention of, as by waving a flag,” a usage dating from the mid-1800s; down was added in the first half of the 1900s.

QUIZ
QUIZ YOURSELF ON "WAS" VS. "WERE"!
Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
Question 1 of 7
“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

How to use flag down in a sentence

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