run hot and cold

listen to the pronunciation of run hot and cold
Английский Язык - Английский Язык
To alternate between two opposite extremes, such as enthusiasm and disinterest or success and failure

The business runs hot and cold; some months our firm doesn't earn enough to cover expenses and other months, we net 400% profits.

hot and cold
Ambivalent; having conflicting emotions
hot and cold
Ambivalently; with conflicting emotions

They went hot and cold about the proposal for a whole year, before finally saying no.

run hot and cold
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