the lowest or deepest part of anything, as distinguished from the top

the bottom of a hill; the bottom of a page.

the under or lower side; underside

the bottom of a typewriter.

the ground under any body of water

the bottom of the sea.

Usually, bottoms. Also called bottom land. Physical Geography . low alluvial land next to a river.

Nautical .

the part of a hull between the bilges, including the keel.

the part of a hull that is immersed at all times.

the cargo space in a vessel.

a cargo vessel.

the seat of a chair.

Informal . the buttocks; rump.

the fundamental part; basic aspect.

bottoms, ( used with a plural verb ) the trousers of a pair of pajamas.

the working part of a plow, comprising the plowshare, landside, and moldboard.

the cause; origin; basis

Try getting to the bottom of the problem.

Baseball .

the second half of an inning.

the last three players in the batting order.

lowest limit, esp. of dignity, status, or rank

When people sink that low, they're bound to reach the bottom soon.

Usually, bottoms. Chemistry . the heaviest, least volatile fraction of petroleum, left behind in distillation after more volatile fractions are driven off.

to furnish with a bottom.

to base or found (usually fol. by on or upon ).

to discover the full meaning of (something); fathom.

to bring (a submarine) to rest on the ocean floor

They had to bottom the sub until the enemy cruisers had passed by.

to be based; rest.

to strike against the bottom or end; reach the bottom.

(of an automotive vehicle) to sink vertically, as when bouncing after passing over a bump, so that the suspension reaches the lower limit of its motion

The car bottomed too easily on the bumpy road.

of or pertaining to the bottom or a bottom.

located on or at the bottom

I want the bottom book in the stack.

lowest

bottom prices.

living near or on the bottom

A flounder is a bottom fish.

fundamental

the bottom cause.

bottom out, to reach the lowest state or level

The declining securities market finally bottomed out and began to rise.

at bottom

in reality; fundamentally

They knew at bottom that they were only deceiving themselves. Also, at the bottom.

bet one's bottom dollar

to wager the last of one's money or resources.

to be positive or assured

You can bet your bottom dollar that something will prevent us from leaving on time.

bottoms up

(used interjectionally to urge the downing of one's drink).

adjective

highest , top , unnecessary

noun

top , exteriority , outside

adjective

basal , base , basement , basic , foundational , ground , last , lowermost , lowest , meat-and-potatoes , nethermost , primary , radical , rock-bottom , underlying , undermost

noun

base , basement , basis , bed , bedrock , belly , deepest part , depths , floor , foot , footing , ground , groundwork , lowest part , nadir , nether portion , pedestal , pediment , rest , seat , sole , substratum , substructure , support , terra firma , underbelly , underneath , underside , bottom line , cause , essence , essentiality , heart , mainspring , marrow , origin , pith , principle , quintessence , root , soul , source , stuff , substance , virtuality , backside , behind , breech , bum * , butt * , buttocks , derriere , fanny * , fundament , posterior , rear , rump , tail , tush , undersurface , foundation , underpinning , rock bottom , core , focus , hub , quick , buttock , derrire , abyss , basal , butt , can , dregs , fanny , fundus , grounds , lees , lowland , precipitate , sediment , surface