A seesaw; a piece of playground equipment consisting of a long board balanced on a central support, on which children ride up and down by pushing the ground with their feet.

The children laughed as they played on the teeter in the park.

An unsteady or wobbling movement; an instance of rocking or swaying back and forth.

There was a momentary teeter before the ladder settled into place.

teeterverb

To move or balance unsteadily; sway back and forth.

The tightrope walker began to teeter as he reached the middle of the rope.

To be in a state of uncertainty or indecision.

The company is teetering on the brink of bankruptcy.

To ride on a seesaw, moving alternately up and down.

After lunch the toddlers teetered on the bright red board behind the daycare.