I think that voice held him most, with its fluctuating, feverish warmth, because it couldn’t be over-dreamed — that voice was a deathless song.
Ferret and the De Jongs and Ernest Lilly — they came to gamble, and when Ferret wandered into the garden it meant he was cleaned out and Associated Traction would have to fluctuate profitably next day.
There are no more uses of "fluctuate" in the book.
Show samples from other sources
Cattle markets tend to fluctuate a lot, and some years, you don’t make much of anything.
Nicholas Sparks -- The Longest Ride
My courage and my resolution is firm; but my hopes fluctuate, and my spirits are often depressed.