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8 ADJ If you say that a person or their behaviour is cool , you mean that they are unfriendly or not enthusiastic. □  I didn't like him at all. I thought he was cool, aloof, and arrogant. □  The idea met with a cool response. ●  cool|ly ADV [usu ADV with v, oft ADV adj] □  'It's your choice, Nina,' David said coolly.

9 ADJ If you say that a person or their behaviour is cool , you mean that they are fashionable and attractive. [INFORMAL , APPROVAL ] □  He was trying to be really cool and trendy.

10 ADJ [v-link ADJ ] If you say that someone is cool about something, you mean that they accept it and are not angry or upset about it. [mainly AM , INFORMAL , APPROVAL ] □ [+ about ] Bev was really cool about it all.

11 ADJ If you say that something is cool , you think it is very good. [INFORMAL ] □  Kathleen gave me a really cool dress.

12 ADJ [ADJ n] You can use cool to emphasize that an amount or figure is very large, especially when it has been obtained easily. [INFORMAL , EMPHASIS ] □  Columbia recently re-signed the band for a cool $30 million.

13 PHRASE If you keep your cool in a difficult situation, you manage to remain calm. If you lose your cool , you get angry or upset. [INFORMAL ] □  She kept her cool and managed to get herself out of the ordeal.

14 PHRASE If you play it cool , you deliberately behave in a calm, unemotional way because you do not want people to know you are enthusiastic or angry about something. [INFORMAL ] □  It's ridiculous to play it cool if someone you're mad about is mad about you too.

15as cool as a cucumber → see cucumber

▸  cool down

1 → see cool 5

2 PHRASAL VERB If someone cools down or if you cool them down , they become less angry than they were. □ [V P ] He has had time to cool down and look at what happened more objectively. □ [V P n] First McNeil had to cool down the volatile Australian 20-year old.

▸  cool off PHRASAL VERB If someone or something cools off , or if you cool them off , they become cooler after having been hot. □ [V P ] Maybe he's trying to cool off out there in the rain. □ [V n P ] She made a fanning motion, pretending to cool herself off. □ [V P n] Cool off the carrots quickly.

cool|ant /kuː lənt/ (coolants ) N‑VAR Coolant is a liquid used to keep a machine or engine cool while it is operating.

cool|er /kuː lə ^r / (coolers )

1 N‑COUNT A cooler is a container for keeping things cool, especially drinks.

2 → see also cool

coo l-hea ded ADJ If you describe someone as cool-headed , you mean that they stay calm in difficult situations. [APPROVAL ] □  She has a reputation for being calm and cool-headed. □  …a cool-headed, responsible statesman.

coo ling-o ff period (cooling-off periods ) N‑COUNT A cooling-off period is an agreed period of time during which two sides with opposing views try to resolve a dispute before taking any serious action. □  There should be a seven-day cooling-off period between a strike ballot and industrial action.

coo l|ing tow|er (cooling towers ) N‑COUNT A cooling tower is a very large, round, high building which is used to cool water from factories or power stations. □  …landscapes dominated by cooling towers and factory chimneys.

coon /kuː n/ (coons )

1 N‑COUNT A coon is a raccoon . [AM , INFORMAL ]

2 N‑COUNT Coon is an extremely offensive word for a black person. [INFORMAL , VERY OFFENSIVE ]

coop /kuː p/ (coops ) N‑COUNT A coop is a cage where you keep small animals or birds such as chickens and rabbits.

co -op (co-ops ) N‑COUNT A co-op is a co-operative. [INFORMAL ] □  The co-op sells the art work at exhibitions.