thwack /ˈθwæk/
 拍地一聲打,強打(vt.)(vi.)打


 Thwack v. t. [imp. & p. p. Thwacked p. pr. & vb. n. Thwacking.]
 1. To strike with something flat or heavy; to bang, or thrash: to thump. “A distant thwacking sound.”
 2. To fill to overflow. [Obs.]


 Thwack, n. A heavy blow with something flat or heavy; a thump.
 With many a stiff thwack, many a bang,
 Hard crab tree and old iron rang.   --Hudibras.

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 thwack
      n : a hard blow with a flat object
      v : deliver a hard blow to; "The teacher smacked the student who
          had misbehaved" [syn: smack]