To fill to overflow.
Other Word Forms of Thwack
Origin of Thwack
From a variant (influenced by whack) of Middle English thakken (“to stroke"), from Old English þaccian (“to touch gently, stroke, tap"), from Proto-Germanic *þakwōnÄ… (“to touch lightly"), from Proto-Indo-European *tag-, *taǵ- (“to touch"). Cognate with Old Dutch þakolōn (“to stroke"), Old Norse þykkr (“a thwack, thump, blow"), Icelandic þjökka, þjaka (“to thwack, thump, beat"), Norwegian tjÃ¥ka (“to strike, beat"), Latin tangō (“touch"). More at tangent.
From American Heritage Dictionary of the English Language, 5th Edition
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