- a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid.
- any such fluid or mixture of fluids.
- any such fluid used as an anesthetic, as nitrous oxide: Did the dentist give you gas for your extraction?
- any such combustible fluid used as fuel: Light the gas in the oven.
- Automotive.
- gasoline.
- the foot-operated accelerator of an automotive vehicle: Take your foot off the gas.
- flatus.
- an explosive mixture of firedamp with air.
- an aeriform fluid or a mistlike assemblage of fine particles suspended in air, used in warfare to asphyxiate, poison, or stupefy an enemy.
- Slang.
- empty talk.
- a person or thing that is very entertaining, pleasing, or successful: The party was an absolute gas, and we loved it.
- a person or thing that affects one strongly.
- to supply with gas.
- to overcome, poison, or asphyxiate with gas or fumes.
- to singe (yarns or fabrics) with a gas flame to remove superfluous fibers.
- to treat or impregnate with gas.
- Slang.
- to talk nonsense or falsehood to.
- to amuse or affect strongly: Her weird clothes really gas me.
- to give off gas, as a storage battery being charged.
- Slang.
- to indulge in idle, empty talk.
- to become drunk (often followed by up).
- to fill the gasoline tank of an automobile, truck, or other vehicle.
- to increase the speed of one's movement or activity; hurry: We'd better step on the gas or we'll be late for the concert.
- a substance in a physical state in which it does not resist change of shape and will expand indefinitely to fill any container. If very high pressure is applied a gas may become liquid or solid, otherwise its density tends towards that of the condensed phase
- any substance that is gaseous at room temperature and atmospheric pressure
- any gaseous substance that is above its critical temperature and therefore not liquefiable by pressure alone
- a fossil fuel in the form of a gas, used as a source of domestic and industrial heat
- (as modifier)
- a gaseous anaesthetic, such as nitrous oxide
- firedamp or the explosive mixture of firedamp and air
- the usual US, Canadian, and New Zealand word for petrol See also gasoline
- step on the gas informal
- to increase the speed of a motor vehicle; accelerate
- to hurry
- a toxic or suffocating substance in suspension in air used against an enemy
- idle talk or boasting
- a delightful or successful person or thing
- US an informal name for flatus
- to provide or fill with gas
- to subject to gas fumes, esp so as to asphyxiate or render unconscious
- to give off gas, as in the charging of a battery
- (in textiles) to singe (fabric) with a flame from a gas burner to remove unwanted fibres
- to talk in an idle or boastful way (to a person)
- to thrill or delight
