cool

adjective

• 1of or at a fairly low temperature:it’ll be a cool afternoon the wind kept them cool
• soothing or refreshing because of its low temperature:a long, cool glass of orange juice
• (especially of clothing) keeping one from becoming too hot:a cool cotton dress
• (of a colour) containing pale blue, green, or grey tones:the bathroom was all glass and cool, muted blues

• 2showing no friendliness towards a person or enthusiasm for an idea or project:he gave a cool reception to the suggestion for a research centre
• free from excitement, anxiety, or excessive emotion:he prided himself on keeping a cool head she seems cool, calm, and collected
• (of jazz) restrained and relaxed.

• 3 informal fashionably attractive or impressive:youngsters are turning to smoking because they think it makes them appear cool
• excellent: [as exclamation]:our office was a sunny room with a computer you didn’t even have to plug in. Cool!
• used to express acceptance of or agreement with something:if people want to freak out at our clubs, that’s cool I told Bill that I was going to write the final draft of the script and he was cool with that

• 4 (a cool ——) informal used to emphasize the size of an amount of money:research for a new drug can cost a cool £50 million

noun

• 1 (the cool) a fairly low temperature:the cool of the night air
• a time or place at which the temperature is pleasantly low:the cool of the day

• 2calmness; composure:he recovered his cool and then started laughing at us

• 3the quality of being fashionably attractive or impressive:all the cool of high fashion

verb

• become or make less hot: [no object]:we dived into the river to cool off [with object]:cool the pastry for five minutes
• become or make calm or less excited: [no object]:after I’d cooled off, I realized I was being irrational [with object]:George was trying to cool him down
• [no object] (cool out) chiefly West Indian relax:a dreamy spot full of sunshine and sea where you could cool out and detox