to change continually; shift back and forth; vary irregularly

The price of gold fluctuated wildly last month.

to move back and forth in waves.

to cause to fluctuate.

verb

hold , persist , remain , stay , abide , adhere , continue , stand fast

verb

alter , alternate , be undecided , blow hot and cold * , ebb and flow , flutter , go up and down , hem and haw * , hesitate , oscillate , rise and fall , seesaw * , shift , swing , undulate , vary , veer , vibrate , wave , waver , yo-yo , change , deviate , seesaw , sway , swerve , unsteady , vacillate , wander , whiffle