THUD

thump, thumping, clump, clunk, thud

(noun) a heavy dull sound (as made by impact of heavy objects)

thud

(verb) strike with a dull sound; “Bullets were thudding against the wall”

thud, thump

(verb) make a dull sound; “the knocker thudded against the front door”

crump, thud, scrunch

(verb) make a noise typical of an engine lacking lubricants

Source: WordNet® 3.1

Etymology

Noun

thud (plural thuds)

The sound of a dull impact.

(US, military, dated slang) Republic F-105 Thunderchief jet ground attack fighter.

Verb

thud (third-person singular simple present thuds, present participle thudding, simple past and past participle thudded)

To make the sound of a dull impact.

Synonyms

• (a dull sound, to make a dull sound): flump, plunk

Coordinate terms

• clang, clash, crash

Source: Wiktionary

Thud, n. Etym: [Cf. AS. a whirlwind, violent wind, or E. thump.]

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition