- (Ireland, colloquial) comical, zany.
"It was gas when the bird flew into the classroom."
"Mary's new boyfriend is a gas man."
- (uncountable) A flammable gaseous hydrocarbon or hydrocarbon mixture (typically predominantly methane) used as a fuel, e.g. for cooking, heating, electricity generation or as a fuel in internal combustion engines in vehicles.
"Gas-fired power stations have largely replaced coal-burning ones."
- (slang) A humorous or entertaining event or person.
"He is such a gas!"
- (countable, chemistry) A chemical element or compound in such a state.
"The atmosphere is made up of a number of different gases."
- (US) Methane or other waste gases trapped in one's belly as a result of the digestive process.
"My tummy hurts so bad, I have gas."
- (US) Gas pedal.
- (uncountable, chemistry) Matter in a state intermediate between liquid and plasma that can be contained only if it is fully surrounded by a solid (or in a bubble of liquid) (or held together by gravitational pull); it can condense into a liquid, or can (rarely) become a solid directly.
"A lot of gas had escaped from the cylinder."
- (countable) A hob on a gas cooker.
"She turned the gas on, put the potatoes on, then lit the oven."
- (baseball) A fastball.
"The closer threw him nothing but gas."
- (uncountable, US) Gasoline; a derivative of petroleum used as fuel.
- (US) To fill (a vehicle's fuel tank) with fuel.
- (intransitive) To talk, chat.
- (transitive) To singe, as in a gas flame, so as to remove loose fibers.
"to gas thread"
- (US) To give a vehicle more fuel in order to accelerate it.
"The cops are coming. Gas it!"
- (transitive) To kill with poisonous gas.
- (transitive) To impregnate with gas.
"to gas lime with chlorine in the manufacture of bleaching powder"
- (intransitive) To emit gas.
"The battery cell was gassing."