danger sign
Ominous visual alert
A danger sign is an indication that something is wrong or threatening.
In the literal sense, it's a posted warning about hazards: The danger signs around the construction site were hard to miss.
More often figurative, referring to symptoms or behaviors that suggest trouble ahead: His refusal to make eye contact was a danger sign.
Also warning sign.
- red flagIndicator of danger
- flashing lightIllumination that pulses
- skull and crossbonesSkeletal danger symbol
- sirenWailing alert device
- cautionCareful attention to risk
wet floor · proceed with caution · storm clouds · thin ice · slippery slope · admonitory · warning · omen · writing on the wall · foreboding · portent · beware · alert · alarm bells · harbinger · symptom · alarm · barricade
- dangersperil, hazard, risk, menace, threat
- park signsno smoking, trail markers, no littering, no pets, no swimming
- safety signswarning signs, warning labels, biohazard, warning, exit signs
- safetysafety helmet, hazard, airbag, alert, occupational safety
- red flagsred flags, warning signs, warning, caution, alarm
- road signsstop, do not enter, no entry, no left turn, yield
danger signall-clear
Signal danger has passed
green light · good omen · welcome sign · thumbs up · clean bill of health
sign, danger, signal, dangerous, signature, endanger, dangers, endangered, signify