Teeter \Tee"ter\, v. i. & t. [imp. & p. p. Teetered; p. pr. & vb. n. Teetering.]

[Prov. E. titter to tremble, to seesaw; cf. Icel. titra to tremble, OHG. zittar[=o]n, G. 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. [U. S.]

[The bobolink] alit upon the flower, and teetered up and down. --H. W. Beecher.

Source: Webster's Revised Unabridged Dictionary (1913)