(automotive) a triangle made of usually red reflective material, used to warn other road users of a broken-down vehicle

plural of warning triangle

Synonym of trigger warning

plural of warning coloration

A warning given too late to be useful.

A sign that indicates a danger, for example to vehicles on a road or of hazardous chemicals. / (figuratively) An indication that someone or something is in danger or at risk

(military) A warning of an ongoing or immediately impending attack.

(meteorology) An indication that a tornado has been sighted in a viewing area.

(set phrase) A friendly warning of something undesirable.

plural of warning sign