verb (v)

• reduce the level of land, as by erosion(verb.contact)

  Antonym:
  aggrade
  

  source: wordnet30
• reduce in worth or character, usually verbally(verb.emotion)

  Synonym:
  demean, disgrace, put down, take down
  

  source: wordnet30
• lower the grade of something; reduce its worth(verb.change)

  Synonym:
  cheapen
  

  source: wordnet30
• To reduce from a higher to a lower rank or degree; to lower in rank; to deprive of office or dignity; to strip of honors; as, to degrade a nobleman, or a general officer.(verb)

  source: webster1913
• To degenerate; to pass from a higher to a lower type of structure; as, a family of plants or animals degrades through this or that genus or group of genera.(verb)

  source: webster1913