seesaw
see-saw
verb
To move up and down alternately, like a seesaw.
"The stock prices seesawed throughout the day."
noun
A long plank balanced in the middle, for children to ride on.
"The children were playing on the seesaw in the park."
Thesaurus
Synonyms: teeterboard, teeter, dandle board, teeter-totter, tilting board, teetertotter, totter