See'saw1, n.
n. [Probably a reduplication of saw, expressing the motion to and fro, backward and forward, in the act of sawing. Cf. also Fr. ci, ça; ci, here, this, ceci, this, and ça, here, that.]
Sense 1. A play among children, in which two persons seated upon the opposite ends of a board which is supported in the middle, move alternately up and down.
Sense 2. A board adjusted for this purpose.
Sense 3. A vibratory or reciprocating motion.
He has been arguing in a circle; there is thus a see-saw between the hypothesis and fact. Sir W. Hamilton.
Sense 4. (Whist-playing.) A certain mutual action of partners in support of each other. Hoyle.
