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\ ˈthwap 
\
\ plural thwaps
Definition of thwap
(Entry 1 of 2)
: a loud, heavy, slapping impact or the sound made by such an impact
The hiss and thwap of the water against the side of the ship was hypnotic.— Melinda M. Snodgrass In a moment she heard the outhouse door slam shut and another tin thwap.— Thom Jones
thwap
verbthwapped; thwapping; thwaps
Definition of thwap (Entry 2 of 2)
: to strike or slap against (something) with a loud, heavy, impact
… she thwapped the gorgeous mahogany desk …— Rhoda Janzen A beach ball thwapped the window, then rolled away.— Antonya Nelson … brought the simple dough together in a stand mixer and kneaded it there until it thwapped quite viciously against the sides of the bowl, threatening to topple it.— Tejal Rao He was way up the street, his cart parked in the middle of the sidewalk, his bag now slung over his shoulder, thwapping into the side of his leg with each long stride he made.— Mary Carter
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Time Traveler for thwap
The first known use of thwap was in 1963
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