verb (v)

• utter obscenities or profanities(verb.communication)

  Synonym:
  blaspheme, curse, cuss, imprecate
  

  source: wordnet30
• to declare or affirm solemnly and formally as true(verb.communication)

  Example:
  Before God I swear I am innocent.
  

  Synonym:
  affirm, assert, aver, avow, swan, verify
  

  source: wordnet30
• promise solemnly; take an oath(verb.communication)

  source: wordnet30
• make a deposition; declare under oath(verb.communication)

  Synonym:
  depone, depose
  

  source: wordnet30
• have confidence or faith in(verb.cognition)

  Example:
  I swear by my grandmother's recipes.
  

  Synonym:
  bank, rely, trust
  Antonym:
  distrust, mistrust, suspect
  

  source: wordnet30
• To affirm or utter a solemn declaration, with an appeal to God for the truth of what is affirmed; to make a promise, threat, or resolve on oath; also, to affirm solemnly by some sacred object, or one regarded as sacred, as the Bible, the Koran, etc.(verb)

  source: webster1913
• To utter or affirm with a solemn appeal to God for the truth of the declaration; to make (a promise, threat, or resolve) under oath.(verb)

  source: webster1913