Definitions

1. noun

A reservoir or pool of water at the head of a canal, lock, or waterwheel, used to regulate the flow of water.

“The hydroelectric dam features a large forebay to store excess water during heavy rainfall.”

2. verb

To store or hold water in a forebay, especially for use in a canal or waterwheel.

“The engineers decided to forebay excess water from the river to power the old mill.”