to chunk, a verb for sound made by a big engine, as in thumping, chunking engines going.. (from the poem “engineers” by Jimmy Garthwaite, in “Noisy poems” by Jill Bennett)
onomatopoeia: 1. the naming of a thing or action by a vocal imitation of the sound associated with it (as buzz, hiss) 2. the use of words whose sound suggests the sense