Bible Dictionaries
Thwack

Webster's Dictionary

(1):

(n.) A heavy blow with something flat or heavy; a thump.

(2):

(v. t.) To fill to overflow.

(3):

(v. t.) To strike with something flat or heavy; to bang, or thrash: to thump.

Bibliography Information
Webster, Noah. Entry for 'Thwack'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/thwack.html. 1828.