bottom

1 the side or part facing downward from something that side of the shelf is supposed to be the bottom, so turn it over before you assemble the bookcase Synonyms underbelly, underbody, underpart, underside, undersurface Related Words belly, sole, toe; base, floor, foot, ground, seat, underpinning; undercarriage Near Antonyms acme, apex, climax, crest, crown, culmination, height, high-water mark, meridian, peak, pinnacle, roof, summit; cusp, head, point, tip, tip-top, zenith Antonyms face, top

2 the surface upon which a body of water lies my missing fishing pole is probably lying on the bottom of the lake Synonyms bed, floor Related Words riverbed; base, basement, foundation, ground Near Antonyms surface

3 the lowest part, place, or point sliding all the way to the bottom of the snow-covered slope Synonyms base, basement, foot, nadir, rock bottom Related Words basis, bed, bedrock, foundation, ground, groundwork, keystone, seat, underpinning Near Antonyms acme, apex, climax, crest, culmination, height, meridian, peak, pinnacle, summit, tip, tip-top, zenith Antonyms head, top, vertex

4 the part of the body upon which someone sits the baby fell backwards onto her bottom Synonyms backside, behind, booty (also bootie) [slang], buttocks, breech, bum, buns, butt, caboose, can, cheeks, derriere (or derrière), duff, fanny, fundament, hams, haunches, heinie [slang], hunkers, keister (also keester) [slang], nates, posterior, rear, rear end, rump, seat, tail, tail end, tush [slang]Related Words beam, stern; moon [slang]

5 a small buoyant structure for travel on water the cargo will be carried by a local bottom Synonyms boat, craft, vessel, watercraftRelated Words catboat, ketch, sailboat, schooner, yacht; bateau, caïque, canoe, catamaran, coracle, curragh (or currach), dhow, dinghy, dink, dory, dugout, flatboat, garvey, gig, johnboat, kayak, outrigger, paddleboat, pinnace, piragua, pirogue, pontoon, pram, punt, raft, rowboat, rowing boat [chiefly British], sampan, scow, scull, shallop, shell, skiff, surfboat, umiak, wherry; cruiser, inboard, motorboat, outboard, powerboat; houseboat, riverboat; auxiliary, bumboat, cutter, jolly boat, launch, lifeboat, longboat, tender, yawl; barge, hoy, keel, keelboat, lighter, narrow boat [British]; towboat, tug, tugboat; ferry, ferryboat, gondola, taxi, water taxi; banker, coble, dragger, gillnetter, hooker, lugger, scalloper, seiner, shrimper, trawler, whaleboat, whaler, workboat; cockleshell, tub; airboat, air-cushion vehicle, hovercraft; hydrofoil, hydroplane; assault boat, PT boat, torpedo boat

6 the lowest point or level their marriage had really hit bottom when they began sleeping in separate rooms Synonyms bedrock, nadir, depth, rock bottom, zeroRelated Words abyss, armpit, pitNear Antonyms bloom, flood tide, flower, glory, heyday; crescendo, high; cap, ceiling, crest, roofAntonyms acme, apex, climax, crown, culmination, head, height, high-water mark, meridian, peak, pinnacle, summit, tip-top, top, zenith

7 an immaterial thing upon which something else rests the bottom of his thesis is the assumption that people are fundamentally good Synonyms basis, bedrock, base, cornerstone, footing, foundation, ground, groundwork, keystone, root, underpinning, warp, warp and woofRelated Words anchorage, bed, brace, bulwark, buttress, framework, infrastructure, mount, prop, shore, stay, substratum, substructure, support; assumption, justification, premise (also premiss), presumption, presupposition, rationale, supposition, theory, thesis, warrant; backbone, center, core, cornerstone, eye, focus, heart, hub, kernel, keystone, nucleus, seat; essence, quintessence, soul, touchstone