闸 zhá sluice
sluice; floodgate; canal lock
How to remember 闸: 门 door + 甲 armor = sluice. The lock keeper opens the heavy door, and a boat full of tourists in plastic knight armor floats into the sluice.
Component breakdown
闸 = 门 door + 甲 armor
- 门 door
- 甲 armor
The lock keeper opens the heavy door, and a boat full of tourists in plastic knight armor floats into the sluice.
How it is used
- A sluice/floodgate and by extension any switch that stops flow: 水闸 (shuǐzhá) water gate, 闸门 (zhámén) floodgate.
- Very common as an electrical/braking control - 电闸 (diànzhá) the main power switch, 拉闸 (lā zhá) to pull the switch / cut power, 刹闸 (shā zhá) to brake a bike.
- So beyond dams it's the 'kill switch' word for electricity and bicycle brakes.