The bottom of something is its underside, or lowest point. You might practice swimming by diving to the bottom of a swimming pool to retrieve pennies.

When you're hungry, you'll eat to the bottom of your ice cream bowl, and if you're looking for your car keys, you may need to dig to the very bottom of your tote bag. A thing's underside is also its bottom, so you might check out the bottom of your foot if you think you have a splinter. Informally, your bottom is also your buttocks, or your backside. It comes from the Old English botm, "ground" or "foundation."

Definitions of bottom
  1. noun
    the lower side of anything
    synonyms: underside, undersurface
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    a flat bottom on which something is intended to sit
    where the sides of the vessel curve in to form the bottom
    the bottom of a shoe or boot; the back part of a shoe or boot that touches the ground and provides elevation
    the underside of footwear or a golf club
    lower side
    in a vessel with two hulls, an enclosed area between the frames at each side
    Cuban heel
    a broad heel of medium height on women's shoes
    French heel
    a fairly high narrow heel on women's shoes
    half sole
    shoe sole extending from the shank to the toe
    innersole, insole
    the inner sole of a shoe or boot where the foot rests
    the outer sole of a shoe or boot that is the bottom of the shoe and makes contact with the ground
    spike, spike heel, stiletto heel
    a very high narrow heel on women's shoes
    stacked heel
    a heel made of many layers of leather
    wedge, wedge heel
    a heel that is an extension of the sole of the shoe
    wineglass heel
    a heel on a woman's shoe in the shape of a wineglass
    type of:
    face, side
    a surface forming part of the outside of an object
  2. noun
    the lowest part of anything
    “they started at the bottom of the hill”
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    the lower part of anything
    (anatomy) the part of an organ nearest its point of attachment
    rock bottom
    the absolute bottom
    type of:
    part, region
    the extended spatial location of something
  3. noun
    a depression forming the ground under a body of water
    synonyms: bed
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    lake bed, lake bottom
    the bottom of a lake
    Davy Jones, Davy Jones's locker, ocean bottom, ocean floor, sea bottom, sea floor, seabed
    the bottom of a sea or ocean
    river bottom, riverbed
    a channel occupied (or formerly occupied) by a river
    creek bed, streambed
    a channel occupied (or formerly occupied) by a stream
    abyssal zone
    the deep sea (2000 meters or more) where there is no light
    continental shelf
    the relatively shallow (up to 200 meters) seabed surrounding a continent
    bathyal district, bathyal zone, continental slope
    the steep descent of the seabed from the continental shelf to the abyssal zone
    neritic zone
    the ocean waters from the low tide mark to a depth of about 100 fathoms
    twilight zone
    the lowest level of the ocean to which light can reach
    dry wash, wash
    the dry bed of an intermittent stream (as at the bottom of a canyon)
    type of:
    depression, natural depression
    a sunken or depressed geological formation
  4. noun
    low-lying alluvial land near a river
    synonyms: bottomland
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    type of:
    ground, land, soil
    material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use)
  5. adjective
    situated at the bottom or lowest position
    “the bottom drawer”
    bottommost, lowermost, nethermost
    farthest down
    lower than a given reference point
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    situated at the top or highest position
    located on a side
    (superlative of `good') having the most positive qualities
    (literal meaning) being at or having a relatively great or specific elevation or upward extension (sometimes used in combinations like `knee-high')
    situated at an apex
    forming or providing a crown or summit
    topmost, upmost, uppermost
    at or nearest to the top
    the topmost one of two
    toward a full side
    lateral, sidelong
    situated at or extending to the side
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  6. adjective
    the lowest rank
    bottom member of the class”
    (superlative of `bad') most wanting in quality or value or condition
  7. verb
    provide with a bottom or a seat
    bottom the chairs”
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    type of:
    furnish, provide, render, supply
    give something useful or necessary to
  8. verb
    strike the ground, as with a ship's bottom
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    type of:
    collide with, hit, impinge on, run into, strike
    hit against; come into sudden contact with
  9. noun
    the fleshy part of the human body that you sit on
    synonyms: ass, backside, behind, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush
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    type of:
    body part
    any part of an organism such as an organ or extremity
  10. noun
    the second half of an inning; while the home team is at bat
    synonyms: bottom of the inning
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    top, top of the inning
    the first half of an inning; while the visiting team is at bat
    type of:
    bout, round, turn
    (sports) a division during which one team is on the offensive
  11. noun
    a cargo ship
    “they did much of their overseas trade in foreign bottoms
    synonyms: freighter, merchant ship, merchantman
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    type of:
    cargo ship, cargo vessel
    a ship designed to carry cargo
  12. verb
    come to understand
    synonyms: fathom, penetrate
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    type of:
    know and comprehend the nature or meaning of
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