To teeter is to waver or sway a bit from lack of balance. When people first learn to ride a bicycle, they inevitably teeter for a while before becoming more skilled and confident.

A beginning gymnast will teeter on the balance beam, and anyone who's not accustomed to high-heeled shoes will teeter as they walk in them. Figuratively, you might even teeter, or hesitate, between two hard choices. A "teeter-totter," or seesaw, is a playground toy for two people, a long board fixed on a center support, designed so that when one kid is down, the other is up.

Definitions of teeter
  1. verb
    move unsteadily, with a rocking motion
    synonyms: seesaw, totter
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    type of:
    move so as to change position, perform a nontranslational motion
  2. noun
    a plaything consisting of a board balanced on a fulcrum; the board is ridden up and down by children at either end
    synonyms: dandle board, seesaw, teeter-totter, teeterboard, teetertotter, tilting board
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    type of:
    plaything, toy
    an artifact designed to be played with
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