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.
实用例句
1. He spends his spare time visiting schools to warn pupils off drugs.
他用自己的业余时间访问学校，告诫小学生远离毒品。来自柯林斯例句
2. Signs across the entrances warn all visitors to stub out their cigarettes.
入口处的告示牌提醒游客们熄灭香烟。来自柯林斯例句
3. Lawrence kept on butting me but the referee did not warn him.
劳伦斯不停地用头撞我，但是裁判并没有警告他。来自柯林斯例句
4. I must warn you against raising your hopes.
我必须警告你不要期望过高。来自柯林斯例句
5. Analysts warn us away from drawing any conclusions.
