See″saw′ (?), n. [Probably a reduplication of saw, to express the alternate motion to and fro, as in the act of sawing.] 1. 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.
2. A plank or board adjusted for this play.
3. A vibratory or reciprocating motion.
He has been arguing in a circle; there is thus a seesaw between the hypothesis and fact. Sir W. Hamilton.
4. (Whist.) Same as Crossruff.