What is "slake trough"

Slake \Slake\, v. i.

1. To go out; to become extinct. ``His flame did slake.''
   --Sir T. Browne.

2. To abate; to become less decided. [R.]
   --Shak.

3. To slacken; to become relaxed. ``When the body's strongest sinews slake.'' [R.]
   --Sir J. Davies.

4. To become mixed with water, so that a true chemical combination takes place; as, the lime slakes.

   Slake trough, a trough containing water in which a blacksmith cools a forging or tool.

n. A trough containing water in which a blacksmith cools a forging or tool.