fore·warn /fɔːˈwɔːn $ fɔːrˈwɔːrn/ verb [transitiveT] 1 WARNto warn someone about something dangerous, unpleasant, or unexpected before it happens 预先警告,事先告知be forewarned of/about something We’d been forewarned of the dangers of travelling at night. 我们预先被告知夜间行路有什么危险。
n Grammar Forewarn is often used in the passive.
► see thesaurus at warn 2. forewarned is forearmed KNOW somethingused to say that it is better to know about something before it happens, so that you can be prepared for it 凡事预则立,先知先戒备,有备无患forewarned is forearmed• You know, forewarned is forearmed.
—forewarning noun [countableC, uncountableU]