1. a red light at the rear of a vehicle that shows when the vehicle is being driven or when the brakes are applied

Examples

• The police officer pulled me over because my left taillight was broken.
• She checked that both taillights were working before driving at night.
• The car’s taillights glowed red in the darkness.
• A cracked taillight needs to be replaced for safety reasons.
• The mechanic replaced the burnt-out taillight bulb.
• Modern cars have LED taillights that last longer than traditional bulbs.