fluctuate between

fluctuate between (something) and (something)

To move or shift between two things. Would you leave the thermostat alone? The temperature in here is only fluctuating between 70 and 72 anyway.
See also: and, between, fluctuate
Farlex Dictionary of Idioms.

fluctuate between (someone and someone else)

to waver between choosing one person and another. I am fluctuating between Sam and Tony as my choice. The manager fluctuated between Mary and Sarah as the new assistant.
See also: between, fluctuate

fluctuate between (something and something else)

to move between one thing and another; to change from one thing to another. Things seemed to fluctuate between the very good and the very bad. The temperature in here fluctuates between too hot and too cold.
See also: between, fluctuate
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • fluctuate
  • fluctuate between (something) and (something)
  • grumble
  • grumble about
  • grumble about (someone or something)
  • groan
  • groan about
  • groan about (someone or something)
  • grouse about
  • grouse about (someone or something)
References in periodicals archive
He anticipated that the EGX-30 index will begin trading Sunday with a low target of 6950 points, before it rises again to fluctuate between 6990 and 7050 points.
There will only be four sessions this week, due to the Coptic Christmas holiday next Thursday, he said, predicting that the stock market will fluctuate between 6,900 and 7,150 points.
EGX aims to close between 6990 -- 7050 points Sunday
The Don't Hold Your Breath hitmaker, who is known for her trim and toned physique, admitted her weight tends to fluctuate between her having a "superhero" attitude and being a little more "relaxed" about her figure.
Nicole not worried by weight gain; MUSIC
One individual's heart rate may fluctuate between 59 and 61 beats per minute (bpm), while another's may swing between 50 and 70 bpm.
Dusty workplace may cause change of heart
About 40 percent report chronic, mild stress; 30 percent fluctuate between periods of stress and calm; and another 30 percent report no stress effects.
Chronic stress still lingers near TMI