a substance or matter in a state in which it will expand freely to fill the whole of a container, having no fixed shape (unlike a solid) and no fixed volume (unlike a liquid)

hot balls of gas that become stars

poisonous gases

we stopped for gas

an entertaining or amusing person or situation

the party would be a gas

kill or harm by exposure to gas

my son was gassed at Verdun

talk excessively about trivial matters

I thought you'd never stop gassing

fill the tank of (a motor vehicle) with petrol

after gassing up the car, he went into the restaurant