"clunks" in the noun sense
1. thump, thumping, clump, clunk, thud
a heavy dull sound (as made by impact of heavy objects)
"clunks" 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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