(Canadian football) A timeout and warning given to the coaches with three minutes to go before the end of each half; after this point, the clock stops at the end of every play. Analogous to the two-minute warning of American football.

plural of black box warning

plural of one-minute warning

plural of three-minute warning

plural of two-minute warning

(UK) A form of all-points bulletin circulated to international ports so that a fleeing suspect can be identified and apprehended.

plural of red flag warning

(meteorology, US) A warning issued by the United States National Weather Service that conditions are ideal for wildfires.

plural of four-minute warning

(idiomatic) A UK Government public alert system in use during the Cold War to advise of an imminent nuclear attack. The "four-minute" adjective was not an accurate timing, but simply used as a euphemism to refer to the incoming attack as being from nuclear missiles.