1. striking forcefully with something flat or heavy
Usage: present participle of thwack

1. very large or impressive
Usage: informal; British

1. the action of striking something forcefully
Usage: gerund form

Examples

• He was thwacking the carpet with a stick to remove the dust.
• The sound of thwacking echoed through the gymnasium.
• She gave the table a good thwacking to get it unstuck.
• That’s a thwacking great fish you caught!
• The thwacking of the hammer could be heard next door.
• Stop thwacking your brother with that pillow.
• They built a thwacking big bonfire for the celebration.