开关 kāiguān power switch
power switch; gas valve; to open the city (or frontier) gate; to open and close; to switch on and off
How to remember 开关: 开 open + 关 to close = power switch.
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How it is used
- A switch (power/light) or valve: 打开开关 (dǎkāi kāiguān) to flip the switch, 灯的开关 (the light switch).
- Literally 开 (on) + 关 (off), the toggle device itself.
- Everyday household/electrical term.