Thwack (thwăk), v. t. [imp. & p. p. Thwacked (?); p. pr. & vb. n. Thwacking.] [Cf. OE. thakken to stroke, AS. þaccian, E. whack.] 1. To strike with something flat or heavy; to bang, or thrash: to thump. "A distant thwacking sound." W. Irving.

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

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.

Thwack (thwăk), v. t. [imp. & p. p. Thwacked (?); p. pr. & vb. n. Thwacking.] [Cf. OE. thakken to stroke, AS. þaccian, E. whack.] 1. To strike with something flat or heavy; to bang, or thrash: to thump. "A distant thwacking sound." W. Irving.

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

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.

• The act of thwacking; a strike or blow, especially with a flat implement.
  
• To whack or hit with flat implement
  
• To beat