raise a red flag
raise a red flag
To offer a sign or signal indicating potential, incipient, or imminent danger or trouble. Didn't the fact that your accountant used to be a drug dealer raise a red flag or two when you started doing business with him? Well, it definitely raised a red flag when he got so angry at me over such a minor thing, but I never thought he could be so unreasonable to live with!
See also: flag, raise, red
Farlex Dictionary of Idioms.
- a red flag
- red flag
- on red alert
- a/the sword of Damocles
- Damocles' sword
- in a blaze of glory
- two-by-four
- tear out
- tear out of
- tear out of (something or some place)