What is the meaning of Thwack?

  1. To hit (someone or something) hard, especially with a flat implement or a stick; to thrash, to whack.

    To hit (someone or something) hard, especially with a flat implement or a stick; to thrash, to whack.

    To drive or force (someone or something) by, or as if by, beating or hitting; to knock.

    To pack (people or things) closely together; to cram.

    To decisively defeat (someone) in a contest; to beat, to thrash.

    To crowd or pack (a place or thing) with people, objects, etc.

    1. To fall down hard with a thump.
    2. To be crammed or filled full.
    3. Of people: to crowd or pack a place.

    To fall down hard with a thump.

    To be crammed or filled full.

    Of people: to crowd or pack a place.

    An act of hitting hard, especially with a flat implement or a stick; a whack; also, a powerful stroke involved in such hitting; a blow, a strike.

    A dull or heavy slapping sound.

    Used to represent the dull or heavy sound of someone or something being hit or slapped.

    Source: wiktionary.org