resreverser

resreverser: noun res-ri-vurs-sur
a palindromic definitional word for a palindrome/ also, an onomatopoeiac, palindromic definitional word for a palindrome.

palindrome: noun pal-in-drohm
from dictionary.com
“a word, line, verse, number, sentence, etc., reading the same backward as forward, as Madam, I'm Adam or Poor Dan is in a droop.”

re onomatopoeia:
a palindrome is reversing, just as a cuckoo cuckoos; therefore: resreverser is reversing

note: resreverser is not the sound of reversing per se, but the action of the sound

res + reverse + r

res:

from the Online Etymology Dictionary:
Latin word once used in various phrases in English, often in legal language, where it means "the condition of something, the matter in hand or point at issue;" literally "thing" (see re). For example res ipsa loquitur "the thing speaks for itself;" res judicata "a point decided by competent authority."

reverse: verb ri-vurs

from the Online Etymology Dictionary:
early 14c., reversen, (transitive), "change, alter" (a sense now obsolete); late 14c., "turn (someone or something) in an opposite direction, turn the other way, turn inside out," also in a general sense, "alter to the opposite;" from Old French reverser "reverse, turn around; roll, turn up" (12c.), from Late Latin reversare "turn about, turn back," frequentative of Latin revertere "turn back, turn about; come back, return" (see revert).

r : a suffix; a noun finisher

alternatively -er