motion-sensor lights
nounUK /ˈməʊ.ʃən ˈsen.sə laɪts/
US /ˈmoʊ.ʃən ˈsen.sɚ laɪts/
Lights that turn on by themselves when something moves nearby.
The motion-sensor lights turned on as soon as we walked into the garage.
OTHER MEANINGS
2. Outdoor lights that switch on when someone approaches, often used for safety.
We installed motion-sensor lights above the front door to scare off burglars.
3. A lighting system that saves energy by only shining when movement is detected.
The hallway uses motion-sensor lights so the bulbs aren't on all night.
4. Lights in a car or building that respond to nearby movement for convenience.
The closet has motion-sensor lights that glow when you open the door.