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Definition of forewarn : To warn beforehand; to give previous warning, admonition, information, or notice to; to caution in advance.

Synonyms:

foreknow, alarm, previse, tip off, lecture, portend, foresight, warn off, sound/raise the alarm, whistle, anticipate, foresee, wake

alert, caution, advise, admonish, enjoin, warn, exhort

forebode, bulldoze, threaten, harass, scare, hint, bully, intimidate, frighten, browbeat, torment

Usage examples:

• We use to count him a friend that will forewarn his neighbour of the danger, when he knoweth thereof, and doth also see that the way his neighbour is walking in doth lead right thereto, especially when we think that our neighbour may be either ignorant or careless of his way. - "The Works of John Bunyan Volume 3", John Bunyan.
• He pulls the cord so tightly, that the bow must break; and I forewarn him, that his authority will, one day, suddenly vanish: already the cloud is gathering; much discontent exists. - "A New Voyage Round the World, in the years 1823, 24, 25, and 26, Vol. 2", Otto von Kotzebue.
• What when they send portents to forewarn the states of Hellas? - "The Memorabilia Recollections of Socrates", Xenophon.