pothole \ˈ ̷ ̷ˌ ̷ ̷\noun 1. a.: a circular hole formed in the rocky bed of a river or stream by the grinding action of stones or gravel whirled round by the water — called also kettle b.: a pot-shaped hole in the surface of a pavement c.: a circumscribed body of water frequented by wildfowl 2.: a deep cave opening upward to the surface