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Definition of underside:

  1. The lower or lowest side of anything.


derriere, rear end, buns, bum, prat, ass, hindquarters, butt, hind end, merchantman, root, rump, tail end, can, fundament, fanny, tooshie, buttocks, over, tail, rear, undersurface, bottomland, bottom of the inning, behind, seat, posterior, bed, bottom, freighter, arse, stern, keister, nates, merchant ship, tush, backside.

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