CLOP
clop, clippety-clop, clip-clop, clopping, clunking, clumping
(noun) the sound of a horse’s hoofs hitting on a hard surface
clop, clump, clunk, plunk
(verb) make or move along with a sound as of a horse’s hooves striking the ground
Source: WordNet® 3.1
Etymology
Noun
clop (plural clops)
(onomatopoeia) The sound of a horse's shod hoof striking the ground.
(slang) My Little Pony-themed pornography
Verb
clop (third-person singular simple present clops, present participle clopping, simple past and past participle clopped)
To make this sound; to walk so as to make this sound.
Anagrams
• CPOL, OLPC, colp, ploc
Source: Wiktionary