WordNet sense 1 (a coarse term for defecation):

shit

WordNet sense 2 (a piece of land where waste materials are dumped):

dumpsite, wasteyard, waste-yard, garbage dump, rubbish dump, trash dump

WordNet sense 3 (sell at artificially low prices):

underprice

WordNet sense 4 (sever all ties with, usually unceremoniously or irresponsibly):

ditch

WordNet sense 5 (fall abruptly):

plunge

WordNet sense 6 (knock down with force):

deck, floor, coldcock