WordReference Random House Learner's Dictionary of American English © 2019
cool /kul/USA pronunciation   adj.,  -er, -est, adv., n., v. 
  1. somewhat cold;
    neither warm nor cold:a cool room.
  2. giving a feeling of coolness: a cool breeze.
  3. providing relief from heat:a cool dress; a cool drink.
  4. not excited;
    calm:cool in the face of disaster.
  5. not hasty;
    deliberate: a cool and calculated action.
  6. lacking in interest, friendliness, or enthusiasm:a cool reply to an invitation.
  7. Informal Terms[before a noun or number] Informal. not exaggerated;
    exactly so: demanding a cool million dollars to release the hostages.
  8. Slang TermsSlang.
    • great;
      excellent:What a cool play that was!
    • socially acceptable, right, or proper: It's not cool to arrive at a party too early.

  1. Informal TermsInformal. in a cool manner;
    coolly: Play it cool.

n. [uncountable]
  1. a cool part, place, or time:in the cool of the evening.
  2. [often: one's +~] calmness;
    poise: Keep your cool and don't get angry.

  1. to (cause to) become cool: [no object]The cake cooled on the plate.[+ off]We cooled off with a quick swim.[+ object]The air conditioner cooled the room adequately.[+ object + off]The swim in the river cooled us off.[+ off + object]They cooled off the horse by pouring water on its back.
  2. to (cause to) become less excited, friendly, interested, or cordial: [no object]She cooled visibly when I invited her to my house.[+ object]Disappointment cooled whatever enthusiasm she might have had.
  1. cool down: 
    • to (cause to) become cooler: [no object]The feverish child just wouldn't cool down.[+ object + down]They tried cold washcloths to cool her down.[+ down + object]to cool down the patients.
    • to (cause to) become less angry or excited;
      (cause to) become calm: [no object]She finally cooled down enough to talk about the fight.[+ object + down]I took him aside and cooled him down before he did anything crazy.
  2. Idioms, Slang Terms cool it, [no object] Slang. calm down:Cool it before you say something you'll be sorry for.

cool•ly, adv. 
cool•ness, n. [uncountable]
    See calm.

WordReference Random House Unabridged Dictionary of American English © 2019
cool  (ko̅o̅l),USA pronunciation adj.,  -er, -est, adv., n., v. 
  1. moderately cold;
    neither warm nor cold:a rather cool evening.
  2. feeling comfortably or moderately cold:I'm perfectly cool, but open the window if you feel hot.
  3. imparting a sensation of moderate coldness or comfortable freedom from heat:a cool breeze.
  4. permitting such a sensation:a cool dress.
  5. not excited;
    under control:to remain cool in the face of disaster.
  6. not hasty;
    deliberate:a cool and calculated action.
  7. lacking in interest or enthusiasm:a cool reply to an invitation.
  8. lacking in warmth or cordiality:a cool reception.
  9. calmly audacious or impudent:a cool lie.
  10. aloof or unresponsive;
    indifferent:He was cool to her passionate advances.
  11. unaffected by emotions;
    dispassionate:She made a cool appraisal of all the issues in the dispute.
  12. Informal Terms(of a number or sum) without exaggeration or qualification:a cool million dollars.
  13. (of colors) with green, blue, or violet predominating.
  14. Slang Terms
    • great;
      excellent:a real cool comic.
    • characterized by great facility;
      highly skilled or clever:cool maneuvers on the parallel bars.
    • socially adept:It's not cool to arrive at a party too early.

  1. Informal Termscoolly.

  1. something that is cool;
    a cool part, place, time, etc.:in the cool of the evening.
  2. coolness.
  3. calmness;
    poise:an executive noted for maintaining her cool under pressure.
  4. Idiomsblow one's cool. See  blow 2 (def. 34).

  1. to become cool (sometimes fol. by down or off):The soup cooled in five minutes. We cooled off in the mountain stream.
  2. to become less ardent, cordial, etc.;
    become moderate.

  1. to make cool;
    impart a sensation of coolness to.
  2. to lessen the ardor or intensity of;
    moderate:Disappointment cooled his early zealousness.
  3. Medicinecool down, to bring the body back to its normal physiological level after fast, vigorous exercise or activity by gradually slowing the pace of activity or by doing gentle exercises or stretches.
  4. cool it, [Slang.]calm down;
    take it easy.
  5. cool off, [Informal.]to become calmer or more reasonable:Wait until he cools off before you talk to him again.
  6. cool one's heels. See  heel 1 (def. 18).
  7. cool out, [Slang.]to calm or settle down;
    relax:cooling out at the beach.
cooling•ly, adv. 
coolish, adj. 
coolly, adv. 
coolness, n. 
  • bef. 1000; Middle English cole, Old English cōl; cognate with Middle Low German kōl, Old High German kuoli (German kuhl). See cold, chill
    • 1.See corresponding entry in Unabridged See  cold. 
    • 5.See corresponding entry in Unabridged collected, self-possessed, unruffled, placid, quiet. See  calm. 
    • 7, 8.See corresponding entry in Unabridged distant, apathetic, reserved, remote, lukewarm.
    • 23.See corresponding entry in Unabridged temper, abate.
    • 1, 3.See corresponding entry in Unabridged
    • 4, 7.See corresponding entry in Unabridged
    • 8.See corresponding entry in Unabridged warm.

Collins Concise English Dictionary © HarperCollins Publishers::

cool /kuːl/ adj
  1. moderately cold: a cool day
  2. comfortably free of heat: a cool room
  3. producing a pleasant feeling of coldness: a cool shirt
  4. able to conceal emotion; calm: a cool head
  5. lacking in enthusiasm, affection, cordiality, etc: a cool welcome
  6. calmly audacious or impudent
  7. informal (esp of numbers, sums of money, etc) without exaggeration; actual: a cool ten thousand
  8. (of a colour) having violet, blue, or green predominating; cold
  9. (of jazz) characteristic of the late 1940s and early 1950s, economical and rhythmically relaxed
  10. informal sophisticated or elegant, esp in an unruffled way
  11. informal excellent; marvellous
  1. not standard in a cool manner; coolly
  1. coolness: the cool of the evening
  2. slang calmness; composure (esp in the phrases keep or lose one's cool)
  3. slang unruffled elegance or sophistication
  1. usually followed by down or off: to make or become cooler
  2. usually followed by down or off: to lessen the intensity of (anger or excitement) or (of anger or excitement) to become less intense; calm down
  3. cool it ⇒ (usually imperative) slang to calm down; take it easy
  4. cool one's heelsto wait or be kept waiting
Etymology: Old English cōl; related to Old Norse kōlna, Old High German kuoli; see cold, chill

ˈcoolly adv ˈcoolness n

'cool' also found in these entries:

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