Red flag meaning: A red flag means a warning

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 ... Definition of red flag in the Idioms Dictionary. red flag phrase. What does red flag expression mean ? Definitions by the largest Idiom Dictionary. Learn the meaning and origins of the idiom ' red flag ' and how to use it in everyday conversation. A red flag is a symbol of socialism, a warning of danger, or something that provokes anger or hostility. Learn the origin, usage, and synonyms of this phrase with Collins English Dictionary.