n. 跷跷板, 跷跷板游戏, 起伏交替的动作

a. 上下或前后摇动的, 交互的

vi. 玩跷跷板, 上下或来回摇动

vt. 使上下或来回摇动

Seesaw \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}.


Seesaw \See"saw`\, v. i. [imp. & p. p. {Seesawad}; p. pr. & vb.
n. {Seesawing}.]
To move with a reciprocating motion; to move backward and
forward, or upward and downward.


Seesaw \See"saw`\, v. t.
To cause to move backward and forward in seesaw fashion.

He seesaws himself to and fro. --Ld. Lytton.


Seesaw \See"saw`\, a.
Moving up and down, or to and fro; having a reciprocating
motion.

Crossruff \Cross"ruff`\ (-r?f`), n. (Whist)
The play in bridge or whist where partners trump each a
different suit, and lead to each other for that purpose; --
called also {seesaw}.