pogo stick
noun [ C ] uk/ˈpəʊ.ɡəʊ ˌstɪk/ us/ˈpoʊ.ɡoʊ ˌstɪk/
蹦蹦跷，弹簧单高跷（一种上端装有把手、下部装有弹簧踏板的跳跃游戏器具）
a child's toy made of a long metal stick with a bar to hold across the top, and a large bar across the bottom for your feet, used to bounce around on