English to English

noun (n)

• the side of an object that is opposite its front(noun.location)

  Synonym:
  back end, rear
  Antonym:
  forepart, front, front end
  

  source: wordnet30
• the fleshy part of the human body that you sit on(noun.body)

  Synonym:
  arse, ass, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, ru
  

  source: wordnet30
• The hinder part, posteriors, or rump of a person or animal.(noun)

  source: webster1913