backuplamp
nounUK /ˈbækʌplæmp/
US /ˈbækʌplæmp/
A backuplamp is a second lamp you keep ready in case your first lamp stops working.
When the power went out, Dad switched on the backuplamp so we could still see.
RELATED WORDS
OTHER MEANINGS
2. A lamp that shines light backward onto a wall or screen.
The stage crew placed a backuplamp behind the set to light the backdrop.
3. A small light attached to the back of a vehicle or bicycle.
Her bike has a backuplamp that blinks red at night.
4. A lamp used as a secondary light source in a photo or video setup.
The photographer added a backuplamp to soften the shadows.