(childish) A humorous and lighthearted nonsense phrase indicating approval or mild excitement: great, wow.

(physics) the process of using the force exerted by a laser to reduce the temperature of a gas, or the spread of velocities of a beam of atoms

(intransitive) To decrease in temperature, activity, or temper. / (transitive) To cause to decrease in temperature, activity or temper.

(Australia, southeast Australia) The arrival of a cold front in the afternoon or evening after a day of high summertime temperatures. The arrival of the front often produces falls in temperature in the order of 10°C to 15°C and sometimes thunderstorm activity.

(of a nuclear reactor) that uses liquid sodium as a coolant

Calm and imperturbable, especially under pressure.

A large device, in the form of a tower-shaped building, in which warm water is cooled by evaporation caused by circulating currents of air

simple past tense and past participle of cool down

Global climate change in the form of declining average temperatures; which was conjectured in the 1970s.

(intransitive) To become cooler, to be reduced in temperature. / (transitive) To cause the temperature of an item to decrease. / (intransitive) To become less agitated.