English to English

verb (v)

• warn in advance or beforehand; give an early warning(verb.communication)

  Example:
  I forewarned him of the trouble that would arise if he showed up at his ex-wife's house.
  

  Synonym:
  previse
  

  source: wordnet30
• To warn beforehand; to give previous warning, admonition, information, or notice to; to caution in advance.(verb)

  source: webster1913