"clunk" in the noun sense

1. thump, thumping, clump, clunk, thud

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

"clunk" in the verb sense

1. clop, clump, clunk, plunk

make or move along with a sound as of a horse's hooves striking the ground

Source: WordNet® (An amazing lexical database of English)

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