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.