land mine

Meanings

1. A mine that is placed on land and designed to explode when stepped upon or touched.
2. A critical subject or situation with concealed or unpredictable implications.
3. 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.
4. A pile of uncollected dog poop left in a space (like a sidewalk, park, or common lawn) that someone might accidentally step in.