be unstable; have ups and downs; "The stock market fluctuates" move or sway in a rising and falling or wavelike pattern; "the line on the monitor vacillated" cause to fluctuate or move in a wave-like pattern
If something fluctuates, it changes a lot in an irregular way. Body temperature can fluctuate if you are ill. the fluctuating price of oil. + fluctuation fluctuations fluc·tua·tion Don't worry about tiny fluctuations in your weight The calculations do not take into account any fluctuation in the share price. if a price or amount fluctuates, it keeps changing and becoming higher and lower = vary fluctuate between (fluctuare, from fluere; FLUENT)