seesaw

nouns

a plaything consisting of a board balanced on a fulcrum; the board is ridden up and down by children at either end

ride on a plank

move up and down as if on a seesaw

seesaw

is a type of (narrower)

move so as to change position, perform a nontranslational motion

"He moved his hand slightly to the right"

move unsteadily, with a rocking motion

seesaw, teeter, totter