warn: [OE] Warn, and its German relative warnen, go back to a prehistoric West Germanic *warnōjan. This was formed from the base *war- ‘watch, be on one’s guard, take care’, which also produced English ward, ware, wary, etc. Germanic *warnjan, which evidently had close links with *warnōjan, was borrowed into French, and surfaced in English as garnish. => garnish, ward, ware, wary
warn (v.)
Old English warnian "to give notice of impending danger," also intransitive, "to take heed," from Proto-Germanic *warnon (cognates: Old Norse varna "to admonish," Old High German warnon "to take heed," German warnen "to warn"), from PIE *wer- (5) "to cover" (see weir). Related: Warned; warning.
例文
1. He spends his spare time visiting schools to warn pupils off drugs.
彼は自分の余暇を使って学校を訪問し、小学生に麻薬離れを戒めた。
2.Signs across the entrances warn all visitors to stub out their cigarettes.
入口の立て札は、観光客にタバコを消すように注意している。
3.Lawrence kept on butting me but the referee did not warn him.
ローレンスはしきりに頭をぶつけてきたが、審判は警告しなかった。
4.I must warn you against raising your hopes.
期待しすぎないように警告しなければなりません。/
5.Analysts warn us away from drawing any conclusions.