oscillate between (two people or things)

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oscillate between (two people or things)

To waver or go back and forth between two different, often contrary people or things that once is trying to choose. I keep oscillating between the job in New York and the one in Los Angeles. You've oscillated between Steve and Tommy long enough—they deserve an answer one way or another.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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

to swing between (choosing) someone and someone else; to swing between (choosing) something and something else. Fred oscillated between going to college and getting a job. The boss oscillated between John and Roger.
See also: between, oscillate
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
But some chemical systems such as the Belousov-Zhabotinskii (BZ) reaction, which slowly oscillates between blue and orange states, work on every point at once.
The system oscillates between the two sets of reactions because the first reaction set paves the way for the second by consuming bromide ions.