teeter-totter

fluctuate lurch seesaw teeter vacillate waver wobble

dangle fishtail flicker librate palpitate pitch pivot reel ripple rock roll stagger sway swing switch swivel thrash toss totter undulate vary vibrate waddle wag waggle waltz wave whirl wiggle

be unsteady pendulate

remain stay

be still stabilize steady

fluctuate teeter vacillate waver

alternate rock sway

remain stay

dangle falter flutter lurch reel seesaw stagger stumble totter tremble waver

balance pivot quiver rock stammer sway topple weave wiggle

tremble precariously

stabilize steady