SEESAW

noun a vibratory or reciprocating motion.

2. seesaw ·noun a plank or board adjusted for this play.

3. seesaw ·noun ·same·as crossruff.

4. seesaw ·vt to cause to move backward and forward in seesaw fashion.

5. seesaw ·adj moving up and down, or to and fro; having a reciprocating motion.

6. seesaw ·vi to move with a reciprocating motion; to move backward and forward, or upward and downward.

7. seesaw ·noun 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.