Thud /(thŭd)/

Thud

n.
  1. 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

v. i. & t.
  1. 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.