<p><strong>Noun</strong></p><ul><li>A recreation in which two children alternately ride up and down while seated at opposite ends of a plank balanced at the middle.</li><li>A plank or apparatus for this recreation.</li><li>An up-and-down or a back-and-forth movement or procedure.</li><li>Whist: a crossruff.</li></ul><p><strong>Adjective</strong></p><ul><li>Moving up and down, back and forth, or alternately ahead and behind: It was a seesaw game with the lead changing hands many times.</li></ul><p><strong>Verb</strong></p><ul><li><p>(used without object)</p><ul><li>To move in a seesaw manner: The boat seesawed in the heavy sea.</li><li>To ride or play on a seesaw.</li><li>To keep changing one's decision, opinion, or attitude; vacillate.</li></ul></li><li><p>(used with object)</p><ul><li>To cause to move in a seesaw manner.</li></ul></li></ul>