motion-detector lights
nounUK /ˈməʊ.ʃən dɪˌtek.tə laɪts/
US /ˈmoʊ.ʃən dɪˌtek.tɚ laɪts/
Lights that turn on by themselves when something moves nearby.
The motion-detector lights came on when the cat walked past the garage.
OTHER MEANINGS
2. Outdoor lamps that switch on automatically to scare away intruders.
We installed motion-detector lights above the back door for safety.
3. Energy-saving lights that only shine when someone is in the room.
The hallway uses motion-detector lights so they stay off when no one is there.
4. A type of smart lighting that reacts to people walking by.
The new motion-detector lights in the office turn on as soon as you enter.