(+ adv./prep.)to walk or move with weak unsteady steps, especially because you are drunk or ill/sick 蹒跚；踉跄；跌跌撞撞 SYN stagger
to be weak and seem likely to fall 摇摇欲坠；摇摇晃晃
the tottering walls of the castle
城堡摇摇欲坠的墙壁
figurative
a tottering dictatorship
濒临瓦解的独裁统治