verb
to vacillate between two different opinions or attitudes
adjective
describing the action of vacillating or being inconsistent
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The committee seems to blow hot and cold on the issue of budget allocation.
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I can never predict how she feels about me, she always blows hot and cold.
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I hate how he blows hot and cold with his friendships, it's so annoying.
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Her emotions towards him seemed to blow hot and cold, never staying constant.