sluice gate; floodgate

a canal lock

An enclosure in a canal or river with gates at each end, used for raising or lowering boats between different water levels.

an automatic safety device designed to stop the flow of current in an electric circuit during an overload

an airtight chamber allowing passage between environments with different air pressures

a controlled passage for entry or exit, such as a boarding gate, customs post, or toll station

(electronics) silicon-controlled rectifier (SCR); thyristor

to jump over a turnstile, typically to bypass a fare gate

gate valve; sluice valve

brake (of a car, bicycle etc)

Gangzha, a district of Nantong City [[南通市|南通市|Nan2 tong1 Shi4]], Jiangsu

electric fusebox or switch box

A control gate or hydraulic structure used to regulate the flow of water into a canal, pipe, or reservoir.

Chinese mitten crab (Eriocheir sinensis); Shanghai hairy crab

the friction material component of a brake system that presses against the wheel or disc to slow it down.

gateway (Taiwan usage)

a type of door or shutter composed of horizontal slats that roll up or down to open or close, commonly used for shopfronts, garages, or industrial openings.

to lower a sluice gate to regulate or stop the flow of water

a gate or valve mechanism used to control the release of excess floodwater from a dam or reservoir