Meaning ofheadwallin English

Noun

1. a wall at a drain outlet; retaining water
   The engineer designed a strong headwall to prevent erosion.
2. the highest cliff in a glacial cirque
   The hikers climbed up to the headwall of the glacial cirque.
3. a steep cliff at the back of a cirque
   The mountain guide warned us about the treacherous headwall above the valley.