Dictionary entry

Forewarn

Webster's Dictionary 1913

Fore‐warn″ (fōr‐wa̤rn″), v. t. [imp. & p. p.Forewarned (–wa̤rnd″); 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.