A dense cloud of dust rises over them, and through the dim obscurity one hears the ceaseless sound of the thwack!
She struck one plank a thwack with the small axe she carried in her hand.
Geddie leaped high and caught the roll with a sounding "thwack."
Then, above the murmur from the temple, he heard a sound in the corridor—a thwack.
A thwack upon his shoulders, almost as loud as that of the peel an hour before, sent him half out of bed.
He was stronger than the prince, otherwise there wouldn't have been a table to thwack.
After a few passes Robin feinted, and, catching the other unawares, dealt him a thwack with the flat of his blade.
Meanwhile, Ben sweeps on like the wind, hearkening even in his haste for the welcome "thwack, thwack" of his father's axe.
thwack fell the broom, and, releasing Joan, the man sought to protect his head with his arms.
Lucifer unhinged the door with one thwack of his big tail, and it fell to the ground with Blow-hard, and broke one of his legs.
"to hit hard with a stick," 1520s, of echoic origin. Related: Thwacked; thwacking. The noun is recorded from 1580s.