red flag
B2CEFR level
55/100Rarity: uncommon
TechnicalRegister
Medicine noun
A symptom or sign during a consultation that signals a potentially serious condition and warrants urgent referral.
Unintentional weight loss with a change in bowel habit is a red flag that means I can't just sell her something over the counter.
New words noun
A warning sign of trouble in a person or situation.
Never asking a single question is a red flag on a date.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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