- A cap that closes the pipe leading to the petrol tank of a motor vehicle: my gas cap wasn’t on tight enoughMore example sentences
- We've all seen that person who drives around with their gas cap open.
- He removed the gas cap from the truck and pulled the nozzle from the pump.
- Not one to waste time, I unscrewed the gas cap and slipped the siphon tube into the tank.
More definitions of gas capDefinition of gas cap in:
- The US English dictionary