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know?
butt (noun)
4. (Informal) The buttocks; the rear end. the fleshy part of the human body that you sit on
2. The larger or thicker end of an object: the butt of a rifle.
3. a. An unburned end, as of a cigarette. b.Informal. A cigarette.
Quite a few synonyms for this part of the body!
buttocks, arse, back end, backside, behind, bum, buns, BUTT, can, fundament, gluteus maximus, haunches, hindquarters, hind end, keister, posterior, prat, rear, rear end, rump, stern, seat, tail, tail end, bottom, behind, fanny, ass
Note:
to work one's butt off = Knochenarbeit leisten, sich den Arsch aufreißen