yawn /ˈjɔn, ˈjɑn/
  哈欠(vi.)打哈欠,張口(vt.)打著哈欠說 ; [口] 令人生厭的人(物)
  yawn /ˈjɔn, ˈjɑn/ 不及物動詞
  裂口,呵欠
  Yawn v. i. [imp. & p. p. Yawned p. pr. & vb. n. Yawning.]
  1. To open the mouth involuntarily through drowsiness, dullness, or fatigue; to gape; to oscitate.  “The lazy, yawning drone.”
  And while above he spends his breath,
  The yawning audience nod beneath.   --Trumbull.
  2. To open wide; to gape, as if to allow the entrance or exit of anything.
  't is now the very witching time of night,
  When churchyards yawn.   --Shak.
  3. To open the mouth, or to gape, through surprise or bewilderment.
  4. To be eager; to desire to swallow anything; to express desire by yawning; as, to yawn for fat livings.  “One long, yawning gaze.”
  Yawn, n.
  1. An involuntary act, excited by drowsiness, etc., consisting of a deep and long inspiration following several successive attempts at inspiration, the mouth, fauces, etc., being wide open.
     One person yawning in company will produce a spontaneous yawn in all present.   --N. Chipman.
  2. The act of opening wide, or of gaping.
  3. A chasm, mouth, or passageway.  [R.]
  Now gape the graves, and trough their yawns let loose
  Imprisoned spirits.   --Marston.
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  yawn
       n : an involuntary intake of breath through a wide open mouth;
           usually triggered by fatigue or boredom; "he could not
           suppress a yawn"; "the yawning in the audience told him
           it was time to stop"; "he apologized for his ostinancy"
           [syn: yawning, oscitance, oscitancy]
       v 1: utter a yawn, as from lack of oxygen or when one is tired;
            "The child yawned during the long performance"
       2: be wide open; "the deep gaping canyon" [syn: gape, yaw]