vacillate between (one person or thing) and (another)
1. To be unable to make a decision or commitment between two different people or things. Which color should we paint the living room? I keep vacillating between sea green and eggshell blue. The play focuses on the countess vacillating between her youthful lover and her rich, powerful husband.
2. To change or fluctuate between two different states or conditions. In this country, the weather can vacillate between rain and sunshine in a matter of minutes. Our teacher vacillates between being way too strict and way too laid back on a daily basis.
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