Teeter
Teeter , verb, intransitive and transitive
[Prov. English titter to tremble, to seesaw; compare Icelandic titra to tremble, Old High German zittarōn, German zittern.]
To move up and down on the ends of a balanced plank, or the like, as children do for sport; to seesaw; to titter; to titter-totter. [United States]
[The bobolink] alit upon the flower, and teetered up and down.