(v) warn in advance or beforehand; give an early warning, Syn. previse, Example:I forewarned him of the trouble that would arise if he showed up at his ex-wife's house
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. [ 1913 Webster ]
We were forewarned of your coming. Shak. [ 1913 Webster ]