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forewarn (someone) about (something)

To inform someone of something in advance. Thanks for forewarning me about the boss's foul mood today—I made sure to steer clear of him.
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forewarn (someone) of (something)

To inform someone of something in advance. Thanks for forewarning me of the boss's foul mood today—I made sure to steer clear of him.
See also: forewarn, of

forewarned is forearmed

One can be appropriately prepared if one knows something in advance. Hey, just so you know, the boss is in a really foul mood today. Forewarned is forearmed, right?
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Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

forewarn someone about something

 and forewarn someone of something
to warn someone about someone or something. They forewarned us of your strange behavior. Didn't we forewarn you about Max's problem?
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Forewarned is forearmed.

Prov. If you know about something beforehand, you can prepare for it. Before you meet Lily, I should tell you that she's a little eccentric. Forewarned is forearmed, right? Check the temperature before you go outside. Forewarned is forearmed.
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McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

forewarned is forearmed

Knowledge in advance enables one to be prepared, as in Let me know when he's in town so I can take the phone off the hook-forewarned is forearmed. This expression originated as a Latin proverb, Praemonitus, praemunitus, which was translated into English by the early 1500s. It soon was put to broader use than its original military applications.
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The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

forewarned is forearmed

People say forewarned is forearmed to mean that if you know about something which is going to happen in the future, you can be ready to deal with it. Find out what side-effects you will have to expect from the treatment, because forewarned is forearmed. Forewarned is forearmed. Even the most enthusiastic guidebooks admit that the food on the train is awful.
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Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

foreˌwarned is foreˈarmed

(saying) if you know about problems, dangers, etc. before they happen, you can be better prepared for them: Jim says that Betty is very angry with me still. Well, forewarned is forearmed, and I’ll have to think up an excuse before I see her.
Fore- in these words means ‘before something happens’ or ‘in advance’.
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Farlex Partner Idioms Dictionary © Farlex 2017

forewarned is forearmed

Advance knowledge enables advance preparation. The term originated as a Latin proverb, Praemonitus, praemunitus, which was adopted into English by the early sixteenth century. Two sources from ca. 1530 put it similarly: “He that is warned is half armed.” Shakespeare used a version in Henry VI, Part 3 (4.1): “I will arm me, being thus forewarn’d.” It was soon extended to nonmilitary applications, such as a hostess preparing for expected guests.
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The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in periodicals archive ?
discrete-asset form, the bundle-of-rights form with forewarning of
Zuwerink Jacks and Devine (2000) proposed that forewarning motivates people to engage in anticipatory counter-arguing.
These all are the possibilities of a point of advantage aACA* for a possible forewarning. For example, if we can connect these links together, we can forewarn the earthquake.
Other times give me and fellow pet-owners no forewarning to stay in or send the dog off to relatives for the evening.
Johnson suffered three broken bones in the assault and was given no forewarning from the crazed Longnecker who muttered, "Sorry about that," as he walked back to the hospitality tent.
Meanwhile, the Indian Regional Satellite Navigation System (IRNSS), the regional navigation system that India is developing in order to replace the Global Positioning System [GPS], is expected to support India's experiments on an earthquake forewarning system, he said.
LOW levels of an immune system protein in the early stages of pregnancy could provide a forewarning of miscarriage, scientists will reveal today.
Degenerative joint disease in any finger is a forewarning of death from heart disease in men, according to new research published yesterday.
If researchers can discern how the temperature shift in the Indian Ocean affects weather around the basin, forecasters might better predict conditions months in advance, in much the same way that El Nino gives a forewarning of unusual climatic events.
The big question now, he stresses, is whether the effect is a forewarning of a significant change in global ozone, or simply an isolated scientific curiosity.
According to the State Minister, prior to the Easter Sunday attacks he had not received any forewarnings on the terror attacks and that he had gotten to know of the forewarnings received by the intelligence units only after the Easter Sunday attacks.
The 1995 OKC bombing saw another repeat; federal officials refused to heed multiple internal forewarnings. All of these "snafus" have been followed by massive cover-ups posing as investigations.
Christians, more than any others, are the ones with whom he would find the greatest resistance if he were not able to scam us, because of the forewarnings in revelation.
The issue is that scientists had forewarnings of the disasters, but these signs went unheeded by either societies in denial, politicians unwilling to take action, or scientists driven by egoism.