seesawad

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]