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general::
Phrase(s): 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., Phrase(s): 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.
McGrawhill's American Idioms And Phrasal Verbs