to sometimes like or be interested in something or somebody and sometimes not
to change mood frequently about something or someone
to be “in two minds”, i.e. to be of one opinion, then change your mind and think the opposite.
usually applied to relationships, or potential relationships. It is commonly used to express frustration that a potential partner seems sometimes to invite and sometimes to reject offers of friendship /love.
Why are you blowing hot and cold simultaneously? Tell me clearly whether you want to go with it, or not.
Her boyfriend keeps running hot and cold whenever she asks him to marry her.
I really like him, but I’m confused. He seems to blow hot and cold – one minute he likes me, and the next, he’s ignoring me!
Terry had a terrible time with her – she really messed with his mind! She was always blowing hot and cold about whether she wanted to date him or not.
I don’t think it’s fair when people blow hot and cold, and don’t tell you clearly what they want.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.