Thwack /(thwăk)/

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.
  2. To fill to overflow. [Obs.]

Thwack

n.
  1. 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.