(air traffic control) an airspace within which it is dangerous for aircraft to fly.

Substances, natural or man-made, which are intrinsically dangerous or otherwise pose a safety hazard. Examples include explosives, poisons, and corrosives.

(military) The areas between a weapon and its target in which the trajectory is not greater than the typical height of a human (about 1.8 meters)

Extra payment given to anybody, civilian or soldier, who is employed in a situation where the working conditions or locale are considered to be hazardous.

(Australian rules football) Kicking at the ball when there is a risk of kicking an opposition player who is trying to pick it up or otherwise close to it. Such a kick is against the rules and results in a free kick to the opponent.

(usually with the definite article) a breach, place which is hard to defend; a danger, requiring bravery

plural of gap of danger

(rail transport) A signal set at danger and showing a red light or other stop indication, which a train driver must not pass until it changes or until manually cleared past the signal by a dispatcher.

plural of danger signal

possessing a weapon and likely to try to harm or kill someone by using it