From The Collaborative International Dictionary of English v.0.44 [gcide]:
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
56 Moby Thesaurus words for "underbelly": abdomen, abomasum, bay window, bed, bedrock, beerbelly, belly, bottom, bottom side, breadbasket, breech, buttocks, craw, crop, diaphragm, downside, embonpoint, first stomach, fundament, gizzard, gullet, gut, hardpan, honeycomb stomach, kishkes, lower side, lowest layer, lowest level, manyplies, maw, midriff, nether side, nethermost level, omasum, paunch, pot, potbelly, potgut, psalterium, pusgut, rennet bag, reticulum, rock bottom, rumen, second stomach, spare tire, stomach, substratum, swagbelly, third stomach, tum-tum, tummy, underlayer, underneath, underside, ventripotence
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