n a plaything consisting of a board balanced on a fulcrum; the board is ridden up and down by children at either end
v move unsteadily, with a rocking motion
n. 踉跄( teeter的名词复数 ); 摇摆; <美>跷跷板; <鸟>斑鹬
v. 摇晃地站立或移动( teeter的第三人称单数 ); <美>玩跷跷板; 处在（灾难或危险的）边缘; 濒临