Word Study
rock bottom
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, understructureFor further exploring for "rock bottom" in Webster Dictionary Online