lightswitch

noun
UK /ˈlaɪt.swɪtʃ/
US /ˈlaɪt.swɪtʃ/

A lightswitch is the little thing on the wall you flip to turn a light on or off.

She flipped the lightswitch and the room got bright.


OTHER MEANINGS

2. A person who operates stage lighting during a performance.

The lightswitch dimmed the lights for the final scene.

3. A small lever or button on a device that controls its power.

He pressed the lightswitch on the flashlight to see in the dark.

4. A sudden change in mood or behavior, as if a switch were flipped.

Her smile was like a lightswitch turning on.