A red flag means a warning or indication of potential dangers or problems. Imagine you’re about to buy something online, but several reviews mention the product falling apart within a week. That’s your red flag waving furiously! This idiom comes from a more literal origin: actual red -colored flags that are used to warn others. An idiom is a phrase or expression whose meaning cannot be understood from the ordinary meanings of its individual words. They’re important because they make ... Learn the meaning and origins of the idiom ' red flag ' and how to use it in everyday conversation. RED FLAG meaning : 1. a flag used as a sign of danger or to tell someone in a race to stop: 2. a flag used as a…. Learn more. Definition of red flag noun in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
