- a deep hole or pit; esp., a deep, round hole formed in the rock of a riverbed by gravel whirling in water
- a deep cave extending downward underground
- A hole or pit, especially one in a road surface. Also called chuckhole.
- A deep round hole worn in rock by loose stones whirling in strong rapids or waterfalls.
- Western US A place filled with mud or quicksand that is a hazard to cattle.
- (archaeology) A pit resulting from unauthorized excavation by treasure hunters or vandals.