cooling one's jets

Verb

cool one's jets (third-person singular simple present cools one's jets, present participle cooling one's jets, simple past and past participle cooled one's jets)

1. (idiomatic, informal) To become less excited, intense, or active; to exercise self-restraint.
   • Star Wars fans who positively can't cool their jets until the 19 May opening of Star Wars prequel The Phantom Menace need wait no longer than until early May.1999 April 7, Joyce Slaton, “Phantom Menace Book Tells All”, in Wired

   Synonyms:

   calm down, chill, chill out, cool off, pull in one's horns, settle down, slow one's roll