Webster's Revised Unabridged Dictionary · 1913

Thud

Thud (thud) , noun

[Compare Anglo-Saxon þōden a whirlwind, violent wind, or English thump.]

A dull sound without resonance, like that produced by striking with, or striking against, some comparatively soft substance; also, the stroke or blow producing such sound; as, the thrud of a cannon ball striking the earth.
At every new thud of the blast, a sob arose. — Jeffrey
At intervals there came some tremendous thud on the side of the steamer. — C. Mackay

Thud (thud) , verb, intransitive and transitive

To make, or strike so as to make, a dull sound, or thud.
Hardly the softest thudding of velvety pads. — A. C. Doyle
The waves break into spray, dash and rumble and thud below your feet. — H. F. Brown