see cool down.
Also, cool down or out. Calm down, become less ardent, angry, or agitated, as in We can't discuss it until you've cooled off. The verb cool alone has been used in this sense since approximately a.d. 1000; off and down were added in the late 1800s, and Davy Crockett's Almanac (1836) had: “Resting a while, just long enough to cool out a little.”
Also, cool out. Kill someone, as in They threatened to cool off his brother. [Slang; first half of 1800s] Also see cool out, def. 2.
Words nearby cool off
How to use cool off in a sentence
Although the blood-spattered offices will be off-limits, staff have vowed to continue producing the magazine.France Mourns—and Hunts|Nico Hines, Christopher Dickey|January 8, 2015|DAILY BEAST
A passing off-duty school safety officer named Fred Lucas said that he had been told the man was a drug dealer.Shot Down During the NYPD Slowdown|Michael Daly|January 7, 2015|DAILY BEAST
It’s cool because Trenchmouth opened for Green Day in the early ‘90s in Wisconsin.Coffee Talk with Fred Armisen: On ‘Portlandia,’ Meeting Obama, and Taylor Swift’s Greatness|Marlow Stern|January 7, 2015|DAILY BEAST
The NOPD fired Knight in 1973 for stealing lumber from a construction site as an off-duty cop.
The off-year special election into which Duke threw himself drew little media notice at first.
A far-off volley rumbled over the plain, and a few birds stirred uneasily among the trees.The Red Year|Louis Tracy
Things looked anxious for a bit, but by this morning's dawn all are dug in, cool, confident.Gallipoli Diary, Volume I|Ian Hamilton
It mounted straight as a plume for a little way, until it met the cool air of evening which was beginning to fall.The Bondboy|George W. (George Washington) Ogden
He has told me that their society produced on him the effect of the cool hands of saints against his cheek.The Joyous Adventures of Aristide Pujol|William J. Locke
I laved his pain-twisted face with the cool water and let a few drops trickle into his open mouth.Raw Gold|Bertrand W. Sinclair