tot·tery /ˈtɑtəri/
  (a.)蹣跚的,搖搖欲倒
  Tot·ter·y a. Trembling or vaccilating, as if about to fall; unsteady; shaking.
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  tottery
       adj : unsteady in gait as from infirmity or old age; "a tottering
             skeleton of a horse"; "a tottery old man" [syn: tottering]