THESAURUS
rock bottom
base, basement, basis, bearing wall, bed, bedding, bedrock, belly, best, bottom, bottom side, bottommost, breech, buttocks, cut, deepest, downside, floor, flooring, fond, footing, foundation, fundament, fundamental, giveaway, ground, grounds, groundwork, half-price, hardpan, lower side, lowest, lowest layer, lowest level, marked down, nether side, nethermost, nethermost level, pavement, principle, radical, reduced, riprap, rudiment, sacrificial, seat, sill, slashed, solid ground, solid rock, stereobate, stylobate, substratum, substruction, substructure, terra firma, underbelly, underbuilding, undercarriage, undergirding, underlayer, undermost, underneath, underpinning, underside, understruction, understructure
