(military, slang) On an aircraft carrier, the state where fighters and crew are on guard, standing by in the aircraft, strapped in and ready to be launched in five minutes or less.

(Internet slang) A warning that information to follow may cause the reader to laugh unexpectedly and, if drinking, cause drink to exit the nose.

Used other than figuratively or idiomatically: see spoiler, alert: a warning that plot elements in a drama will be exposed.

An indication, placed in a text, that the plot of a drama is about to be exposed / Indicates that the speaker is about to reveal something unanticipated or unpleasant

An alert sent by e-mail or similar electronic means.

plural of e-alert

(US, Canada) A public notification of a missing senior with dementia.

plural of drink alert

plural of silver alert

plural of red alert