Seesaw

1. Same as Crossruff.
2. A plank or board adjusted for this play.
3. Moving up and down, or to and fro; having a reciprocating motion.
4. To move with a reciprocating motion; to move backward and forward, or upward and downward.
5. To cause to move backward and forward in seesaw fashion.
6. A vibratory or reciprocating motion.
7. 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.