甌おう穴けつ

noun

pothole; giant's kettle

A geological term for a cylindrical hole formed in bedrock by the abrasive action of stones and water currents, often found in riverbeds.

• この川かわの上じょう流りゅうには大おおきな甌おう穴けつがいくつもある。

  There are several large potholes in the upper reaches of this river.

• 甌おう穴けつは長ながい年ねん月げつをかけて水すい流りゅうと小こ石いしによって形けい成せいされる。

  Potholes are formed over many years by water currents and pebbles.