A circular hole formed in the rocky beds of rivers by the grinding action of stones or gravel whirled round by the water in what was at first a natural depression of the rock.
- 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 U.S. A place filled with mud or quicksand that is a hazard to cattle.