Definition of thwack in English:

thwack

Syllabification: thwack
Pronunciation: /THwak
 
/

verb

[with object]
  • Strike forcefully with a sharp blow: she thwacked the back of their knees with a cane
    More example sentences
    • So she took a stick and started thwacking my thighs like she was threshing wheat.
    • For a few short weeks each autumn, in playgrounds across the land, the tinny buzz of the Nokia and the iPod is supplanted by the sound of youngsters thwacking their nuts.
    • Four minutes after making his entrance, the wafer-like winger was thwacking Neilson from behind to concede a preventable penalty.

noun

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  • A sharp blow: he hit it with a hefty thwack
    More example sentences
    • The sound of repeated thwacks lures you to the roasted-duck counter, where a small man with a big cleaver reduces a whole mahogany-colored bird into a pile of steamy, mouthwatering chunks in seconds.
    • Guys are dumb, it takes us a couple of thwacks before we stop hitting our heads on walls.
    • Then, grunting with effort, they lunge furiously, colliding with resounding thwacks, red-faced and panting.
    Synonyms
    slap, whack, smack, wallop

Origin

late Middle English: imitative.

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