advise, caution, warn, admonish, counsel

動(dòng)詞 warn:

1. notify of danger, potential harm, or risk
2. admonish or counsel in terms of someone's behavior
   同義詞：discourage, admonish, monish
3. ask to go away
4. notify, usually in advance

1. He warned us against pickpockets.
   他告訴我們要小心扒手。
2. I warned them that there might be snakes in the woods.
   我提醒他們樹(shù)林里可能有蛇。
3. He warned me against going there at night.
   他警告我晚上不要到那去。

warn

v.（動(dòng)詞）
warned,warn.ing,warns
v.tr.（及物動(dòng)詞）
To make aware in advance of actual or potential harm, danger, or evil.
警告：在真實(shí)或可能的危害、危險(xiǎn)或邪惡到來(lái)之前使知曉
To admonish as to action or manners.
告誡：對(duì)行為或禮節(jié)等的告誡
To notify (a person) to go or stay away:
通知（某人）離開(kāi)或呆在一旁：
例句：
warned them off the posted property.
通知他們不要去碰登記過(guò)的財(cái)產(chǎn)

To notify or apprise in advance:
預(yù)告：預(yù)先通知或告訴：
例句：
They called and warned me that they might be delayed.
他們打來(lái)電話，預(yù)先告訴我他們可能耽擱一會(huì)兒

v.intr.（不及物動(dòng)詞）
To give a warning.
發(fā)出警告

來(lái)源：
Middle English warnen
中古英語(yǔ) warnen
from Old English warnian * see wer- 4
源自 古英語(yǔ) warnian *參見(jiàn) wer- 4

【引伸】
warn.er
n.（名詞）
<參考詞匯><同義詞>warn,caution,forewarnThese verbs mean to give someone notice of and put the person on guard against actual or possible danger or risk.
這些動(dòng)詞表示通知某人以使其對(duì)真實(shí)或潛在的危險(xiǎn)或險(xiǎn)情有所警覺(jué)。
Warn, the most inclusive, implies well-timed notice that causes a person to be alert, vigilant, or wary:
Warn 含義最廣，它含有通知及時(shí)以使某人留神、警覺(jué)或警惕之意：
例句：
.My father was warned by the neighbors that we were in great danger. (W.H. Hudson).
.鄰居告訴我父親，我們的處境極端危險(xiǎn). (W.H.哈得孫）。

Caution often suggests a warning that calls for the use of circumspection or prudence,as in avoiding unpleasant consequences:
Caution 經(jīng)常表示引起謹(jǐn)慎或小心的警告，如警告避免不良影響：
例句：
The Secretary of State cautioned that terrorism would be countered by retaliatory action.
國(guó)務(wù)卿警告說(shuō)，恐怖主義將要受到報(bào)復(fù)性還擊。

Forewarn intensifies the sense of advance notice:
Forewarn 強(qiáng)調(diào)了事先通知這一意義：
例句：
Forewarned is forearmed.
先通知的就先準(zhǔn)備好