fore·warn /forˈwɔrn, fɔr-/
  (vt.)預先警告
  Fore·warn v. t. [imp. & p. p. Forewarned p. pr. & vb. n. Forewarning.] To warn beforehand; to give previous warning, admonition, information, or notice to; to caution in advance.
     We were forewarned of your coming.   --Shak.
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  forewarn
       v : warn in advance or beforehand; give an early warning; "I
           forewarned him of the trouble that would arise if he
           showed up at his ex-wife's house" [syn: previse]