nodding
  點頭振動
  Nod, v. t. [imp. & p. p. Nodded p. pr. & vb. n. Nodding.]
  1. To incline or bend, as the head or top; to make a motion of assent, of salutation, or of drowsiness with; as, to nod the head.
  2. To signify by a nod; as, to nod approbation.
  3. To cause to bend. [Poetic]
     By every wind that nods the mountain pine.   --Keats.
  Nod·ding a. Curved so that the apex hangs down; having the top bent downward.
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  nodding
       adj : having branches or flower heads that bend downward; "nodding
             daffodils"; "the pendulous branches of a weeping
             willow"; "lilacs with drooping panicles of fragrant
             flowers" [syn: cernuous, drooping, pendulous]
  nod
       n 1: a sign of assent or salutation or command
       2: the act of nodding the head
       v 1: express or signify by nodding; "He nodded his approval"
       2: lower and raise the head, as to indicate assent or agreement
          or confirmation; "The teacher nodded when the student gave
          the right answer"
       3: let the head fall forward through drowsiness; "The old man
          was nodding in his chair"
       4: sway gently back and forth, as is in a nodding motion; "the
          flowers were nodding in the breeze"
       5: be almost asleep; "The old man sat nodding by the fireplace"
       [also: nodding, nodded]