nod /ˈnɑd/
  點頭,打盹,擺動(vi.)點頭,打盹(vt.)點頭表示,點(頭)
  Nod v. i.
  1. To bend or incline the upper part, with a quick motion; as, nodding plumes.
  2. To incline the head with a quick motion; to make a slight bow; to make a motion of assent, of salutation, or of drowsiness, with the head; as, to nod at one.
  3. To be careless or inattentive; to make a mistake from lack of attention.
     Nor is it Homer nods, but we that dream.   --Pope.
  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 n.
  1. A dropping or bending forward of the upper part or top of anything.
  Like a drunken sailor on a mast,
  Ready with every nod to tumble down.   --Shak.
  2. A quick or slight downward or forward motion of the head, in assent, in familiar salutation, in drowsiness, or in giving a signal, or a command; as, a nod of approval.
     A look or a nod only ought to correct them [the children] when they do amiss.   --Locke.
     Nations obey my word and wait my nod.   --Prior.
  The land of Nod, sleep.
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  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]
  Nod
     exile; wandering; unrest, a name given to the country to which
     Cain fled (Gen.4:16). It lay on the east of Eden.