Seesaw

Definition:

(n.) A play among children in which they are seated upon the opposite ends of a plank which is balanced in the middle, and move alternately up and down.
(n.) A plank or board adjusted for this play.
(n.) A vibratory or reciprocating motion.
(n.) Same as Crossruff.
(v. i.) To move with a reciprocating motion; to move backward and forward, or upward and downward.
(v. t.) To cause to move backward and forward in seesaw fashion.
(a.) Moving up and down, or to and fro; having a reciprocating motion.

Compare seesaw with other words:

seesaw vs. swing