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cool one's jets

  1. (informal) To become less excited, intense, or active; to exercise self-restraint.
    • 1999 April 7, Joyce Slaton, "Phantom Menace Book Tells All," Wired:
      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.
    • 2004 Oct. 6, Kirk Honeycutt, "Taxi (film review)," The Hollywood Reporter:
      Belle's boyfriend Jesse (Henry Simmons) is left to cool his jets while his woman bangs around the New York area.