Below are possible answers for the crossword clue Raise a red flag.
4 letter answer(s) to raise a red flag
WARN
admonish or counsel in terms of someone's behavior; "I warned him not to go too far"; "I warn you against false assumptions"; "She warned him to be quiet"
ask to go away; "The old man warned the children off his property"
notify of danger, potential harm, or risk; "The director warned him that he might be fired"; "The doctor warned me about the dangers of smoking"
notify, usually in advance; "I warned you that I would ask some difficult questions"
Other crossword clues with similar answers to 'Raise a red flag'