vi to become less hot; to lose heat.
2. cool ·superl not retaining heat; light; as, a cool dress.
3. cool ·vi to lose the heat of excitement or passion; to become more moderate.
4. cool ·vt to make cool or cold; to reduce the temperature of; as, ice cools water.
5. cool ·superl manifesting coldness or dislike; chilling; apathetic; as, a cool manner.
6. cool ·superl moderately cold; between warm and cold; lacking in warmth; producing or promoting coolness.
7. cool ·superl applied facetiously, in a vague sense, to a sum of money, commonly as if to give emphasis to the largeness of the amount.
8. cool ·vt to moderate the heat or excitement of; to allay, as passion of any kind; to calm; to moderate.
9. cool ·noun a moderate state of cold; coolness;
said of the temperature of the air between hot and cold; as, the cool of the day; the cool of the morning or evening.
10. cool ·superl quietly impudent; negligent of propriety in matters of minor importance, either ignorantly or willfully; presuming and selfish; audacious; as, cool behavior.
11. cool ·superl not ardent, warm, fond, or passionate; not hasty; deliberate; exercising self-control; self-possessed; dispassionate; indifferent; as, a cool lover; a cool debater.