run hot and cold

run hot and cold

To vacillate between two opposing or starkly different states, opinions, or behaviors. Dan: "So, how are things going between you and Mallory?" Sarah: "Hard to tell. She runs hot and cold one day to the next, so I can never tell how she really feels!" The boss has been running hot and cold about whether or not we're going through with this project. I wish she would just make a decision!
See also: and, cold, hot, run
Farlex Dictionary of Idioms.
See also:
  • blow hot and cold
  • blow hot and cold, to
  • quot homines tot sententiae
  • tot
  • or otherwise
  • be strange bedfellows
  • be/make strange bedfellows
  • bedfellow
  • make strange bedfellows
  • odd bedfellows
References in periodicals archive
Kunzel seems to run hot and cold, sometimes producing invigorating readings, other times not so energetic.