1. 跷跷板：teeter ladder 云梯 | teeter-totter 跷跷板 | teeth forming machine for band sawblade 锯条开齿机

2. (秋千)：◆ season-ticket holder(上班族) commuter | ◆ seesaw(秋千) teeter-totter | ◆ set square (三角板) triangle

3. 跷跷板,名词：teeter 摇晃, 动词 | teeter totter 跷跷板,名词 | teethe 出牙,动词

noun

1. a plaything consisting of a board balanced on a fulcrum
the board is ridden up and down by children at either end

Synonym: seesawteeterteetertotterteeterboardtilting boarddandle board