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.

synonym: previse.

Roget 668: warn, caution; forewarn, prewarn^†; admonish, premonish^†; give notice, give warning, dehort^†; menace etc. (threaten) 909; put on one's guard; sound the alarm etc. 669; croak.    beware, ware; take warning, take heed at one's peril; keep watch and ward etc. (care) 459.    ... show more

Roget 510: foresee; look forwards to, look ahead, look beyond; scent from afar; look into the future, pry into the future, peer into the future.    see one's way; see how the land lies, get the lay of the land, see how the wind blows, test the waters, see how the cat jumps.    anticipate; expect etc. 507; be beforehand etc. (early) 132; predict etc. 511; foreknow, forejudge, forecast; presurmise^†; have an eye to the future, have an eye to the main chance; respicere finem [Lat.]; keep a sharp lookout etc. (vigilance) 459; forewarn etc. 668.    ... show more

Roget 511: predict, prognosticate, prophesy, vaticinate, divine, foretell, soothsay, augurate^†, tell fortunes; cast a horoscope, cast a nativity; advise; forewarn etc. 668.    presage, augur, bode; abode, forebode; foretoken, betoken; prefigure, preshow^†; portend; foreshow^†, foreshadow; shadow forth, typify, pretypify^†, ominate^†, signify, point to.    usher in, herald, premise, announce; lower.    hold out expectation, raise expectation, excite expectation, excite hope; bid fair, promise, lead one to expect; be the precursor etc. 64.    [predict by mathematical or statistical means from past experience] extrapolate, project.    ... show more

Dutch: vooraf waarschuwen, waarschuwen