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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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

vacillate between (someone and someone else) (or something and something else)

to waver between a choice of people or a choice of things. He kept vacillating between Fred and Alice. Wayne vacillated between chocolate and vanilla.
See also: between, vacillate
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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