teeter

To move or sway unsteadily or unsurely; totter.

To alternate, as between opposing attitudes or positions; vacillate.

To be close to or in danger of failure or ruin.

Hence To move about foolishly and aimlessly.

To see-saw; move up and down in see-saw fashion.

A see-saw.

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.

To tilt back and forth on an edge.

move unsteadily, with a rocking motion