An unforeseen source of danger; a pitfall.
An antipersonnel device deliberately hidden or disguised as a harmless object.
A practical joke by which something is made to fall upon someone entering through a door, or the like.
A critical subject or situation with concealed or unpredictable implications.
A piece of exercise device consisting of a pivoting tube attached to the ground to which a barbell can be fitted to lift it off the ground.
A mine that is placed on land and designed to explode when stepped upon or touched.