present participle of keep a cool head

simple past tense and past participle of cool one's heels

Third-person singular simple present indicative form of cool one's heels

plural of cool-o-meter

simple past tense and past participle of cool one's jets

Third-person singular simple present indicative form of cool one's jets

Alternative form of cooler heads will prevail

(often imperative) To refrain from speech where it is futile or not wanted; to shut up.

Synonym of save one's breath to cool one's porridge

So as to grow cooler; losing warmth.