The Oxford Thesaurus An A-Z Dictionary of Synonyms - bottomn.

1) seat, buttocks, rear, behind, rear end, derriЉre, rump, posterior, hindquarters, breech, fundament, gluteus maximus, Colloq backside, butt, prat, Brit bum , US can, duff, keister or keester, hinie; Taboo Brit arse, US ass; Slang US tokus or tochis or tuchis, tushie or tushy or tush: He just sits there on his bottom, never doing a bit of work. 2) base, foot, foundation, groundwork, substructure, footing, underpinning, fundament: A ditch was dug along the bottom of the wall. 3) basis, foundation, source, origin, cause, heart, nub: We have to get to the bottom of the problem. 4) depths, Davy Jones's locker; bed: The ship sank to the bottom of the sea. 5) at bottom. basically, fundamentally, in the final or last analysis, really, in reality, truly, in truth, essentially: Despite her behaviour at the party, at bottom she is very reserved. 6) Bottoms up! Prosit!, To your (very good) health!, Cheers!, Here's to -!, Skol!: Here's to the whole team - Bottoms up!