vary between

vary between (someone or something)

1. To alternate between two or more different options, choices, or possibilities. I keep varying between graphite and ink for my drawings. The senator keeps varying between wildly different tones during his campaign—one moment he's making tearful emotional appeals, and the next he's spewing the most hateful vitriol against his opponents.
2. To alternate or fluctuate between two or more different states or conditions. The weather around here varies between cloudy and rainy—not a lot of sun in these parts.
3. To change or differ between two or more people, things, or groups. Reception of the proposed legislation has varied between demographics but has largely been positive. Specific laws will vary between one country and another, so you'll want to look into it before your trip across Europe this summer.
See also: between, vary
Farlex Dictionary of Idioms.

vary between (someone and someone else)

 and vary between something and something else
to fluctuate in choosing between people or things. In choosing a bridge partner, Sam varied between Tom and Wally. I varied between chocolate and vanilla cake for dessert.
See also: between, vary

vary between (something and something else)

to fluctuate between one thing and another. The daytime temperatures vary between 80 and 90 degrees. She varies between angry and happy.
See also: between, vary
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • varied
  • vary
  • vary between (someone or something)
  • vary between (someone or something) and (someone or something else)
  • be on the fence
  • pull (one) off the fence
  • ink in
  • alternate
  • alternate between
  • alternate between (people or things)
References in periodicals archive
The diameters of the ball indentor and foot vary between methods.
Understanding the IRHD and durometer methods used in rubber hardness testing
State due dates vary between six and 18 months after the date of death.
State estate and gift tax provisions
Like Wunderlich, Mackowiak's team found that normal temperatures vary between individuals (by as much as 4.8[degree]F) and even within individuals over the course of a day (by up to 1.09[degree]F).
Body temperature: don't look for 98.6 F
This test allows the pattern of coefficients on the paper rate to vary between the 1960s and 1970s as compared with the 1980s but preserves the long-run properties of the equation.
The transmission channels of monetary policy: how have they changed?