Red flag

noun

Word Frequency: 1.1

Definitions

1.nounA cue, warning, or alert; a sign or signal that something is wrong.

"Improper formatting is a red flag to look for other problems with the data."

2.nounIn the United Kingdom and some other countries, a flag formerly used by a railway guard to warn the driver not to start the train.

3.nounA common symbol, usually in the form of a banner, for leftist revolutionary ideologies, especially socialism.

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