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

very amusing or entertaining

Ruthie, that's gas—you're a gem