Clunk

Noun

 * 1) a dull, metallic sound, especially one made by two bodies coming into contact

Verb

 * 1) to make such a sound

Thesaurus
bump, chink, click, clink, clop, clump, crump, dull thud, flick, flump, pad, pat, patter, pitapat, pitter-patter, plump, plunk, pop, rap, tap, thud, thump, tick, tinkle, tunk