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Verb: blow hot and cold
Usage: informal
  1. Be undecided about something; waver between conflicting positions or courses of action
    "He's been blowing hot and cold about accepting the job offer";
    - hover, vibrate, vacillate, oscillate

Derived forms: blowing hot and cold, blew hot and cold, blows hot and cold, blown hot and cold

Type of: balk, baulk [Brit], hesitate, waffle [N. Amer, informal], waver