danger-signal
Threat notification sign
A danger-signal is a warning sign of trouble or harm—literal or figurative.
Railroad signals, flashing lights, and warning bells are physical danger-signals.
More often the term describes behavioral or situational warnings: His evasiveness was a danger-signal she shouldn't ignore.
The hyphenated form is somewhat old-fashioned; modern usage often prefers danger sign or red flag.
Indicator of danger
- flashing lightIllumination that pulses
- sirenWailing alert device
- alarm bellAudible danger signal
- warning signIndicator of potential danger
caution tape · beacon · strobe · klaxon · horn · buzzer · smoke alarm · indicator light
One who foreshadows
- portentSign of future calamity
- omenProphetic indicator
- forewarningNotice of future trouble
- premonitionAdvance sense of future events
writing on the wall · wake-up call · early warning · indicator · precursor · foreshadowing · bad sign · ill omen
Indicator of danger
- warning signIndicator of potential danger
- body languageUnspoken physical expression
- tone shiftChange in emotional register
- microexpressionMomentary involuntary face signal
gut feeling · intuition · instinct · unease · suspicion · alarm bells · telltale sign · verbal cue
Indicator of disease
- prodromeWarning symptoms before disease
- red flagIndicator of danger
- vital signMeasurable body function
- abnormalityDeviation from expected state
fever · pain · swelling · discoloration · irregular heartbeat · shortness of breath · chest pain · numbness
Conspicuous hues signaling unpalatability
- distress callUrgent plea for aid
- hacklesErectile neck feathers
- growlLow threatening sound
- hissSharp sibilant sound
rattle · startle response · fight-or-flight · stress hormone · adrenaline surge · survival instinct
red flag
Indicator of danger
- flashing lightIllumination that pulses
- sirenWailing alert device
- alarm bellAudible danger signal
warning sign · caution tape · beacon · strobe · klaxon · horn · buzzer · smoke alarm · indicator light · flare
harbinger
One who foreshadows
- portentSign of future calamity
- omenProphetic indicator
- forewarningNotice of future trouble
premonition · writing on the wall · wake-up call · early warning · indicator · precursor · foreshadowing · bad sign · ill omen · bellwether
red flag
Indicator of danger
- warning signIndicator of potential danger
- body languageUnspoken physical expression
- tone shiftChange in emotional register
microexpression · gut feeling · intuition · instinct · unease · suspicion · alarm bells · telltale sign · verbal cue · threat assessment
symptom
Indicator of disease
- prodromeWarning symptoms before disease
- red flagIndicator of danger
- vital signMeasurable body function
abnormality · fever · pain · swelling · discoloration · irregular heartbeat · shortness of breath · chest pain · numbness · health warning
warning coloration
Conspicuous hues signaling unpalatability
- distress callUrgent plea for aid
- hacklesErectile neck feathers
- growlLow threatening sound
hiss · rattle · startle response · fight-or-flight · stress hormone · adrenaline surge · survival instinct
danger-signalall-clear
Signal danger has passed
green light · go-ahead · thumbs-up · clearance · reassurance
danger, signal, dangers, dangerous, dangerously, dangerousness, endangered, endanger, endangers