[], (Noun)

Definitions:
- A gate for controlling the entry of water into a sluice, channel, etc.; specifically a gate or pair of gates at the upstream end of a canal lock.

- A gate at the end of a cage, pen, or chute, used as an aid to handling livestock, which allows the head to pass through but restrains the shoulders.


Phrases:

Origin:
late 18th century; earliest use found in John Smeaton (1724–1792), civil engineer