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.
A perilous, mixed up and troubled situation; a hopeless tangle.
A swampy, soggy area of ground.
To embroil (a person, etc.) in complexity or difficulty.