fore·​warn | \ fȯr-ˈwȯrn \
forewarned; forewarning; forewarns

Definition of forewarn

transitive verb

: to warn in advance

Keep scrolling for more

Synonyms for forewarn


advise, alert, caution, wake, warn

Visit the Thesaurus for More 

Examples of forewarn in a Sentence

I should forewarn you before you come to visit that we have a dog.

Recent Examples on the Web

Easy, right? Be forewarned, though: Tea tree oil has a strong medicinal smell that may or may not make your significant other whine loudly. Chloe Metzger, Marie Claire, "Tea Tree Oil Is the Best Acne Spot Treatment for Sensitive Skin," 24 Sep. 2018 But be forewarned, this method will turn your toothbrush yellow. Lauren Valenti, Marie Claire, "Rubbing These Two Things on Your Teeth Will Make Them Whiter in Minutes," 19 Apr. 2016 Read on to learn about the most disgusting, outrageous things people have found in their food, but be forewarned: There's nothing happy about these meals. Mandy Major, Woman's Day, "10 Strange Objects Found in Food," 3 Nov. 2010 Here’s our top picks, and be forewarned a lot of these sale prices involve mail-in rebates. Ian Paul, PCWorld, "The 5 best deals in Newegg's Early Black Friday Sale," 2 Nov. 2018 Just be forewarned: Weekend brunch waits can be lengthy due to the city's increase in tourism—Nashville saw 14.5 million visitors in 2017, a record number—so reservations are advised. Kristin Luna, Condé Nast Traveler, "11 Best Places for Brunch in Nashville," 27 Feb. 2018 Be forewarned: the crowd on my night could be ruthless about wrong answers. Max Maller, Chicago Reader, "Picture it: Miami, 1987, and The Golden Girls in drag," 26 June 2018 Be forewarned: These rates will change if there's a special event happening nearby. 2. Amy Bartner, Indianapolis Star, "9 (formerly) secret parking spots Downtown," 24 May 2018 Be forewarned, however: The chapels need considerable work and, like a Venice palazzo, will require eternal care. New York Times, "A Chance to Spend 99-Plus Years in Venice (in the Afterlife)," 21 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'forewarn.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of forewarn

14th century, in the meaning defined above

Keep scrolling for more

Learn More about forewarn

Statistics for forewarn

Last Updated

12 Jan 2019

Look-up Popularity

Time Traveler for forewarn

The first known use of forewarn was in the 14th century

See more words from the same century

Keep scrolling for more

More Definitions for forewarn



English Language Learners Definition of forewarn

: to warn (someone) before something happens


fore·​warn | \ fȯr-ˈwȯrn \
forewarned; forewarning

Kids Definition of forewarn

: to warn in advance

Keep scrolling for more

More from Merriam-Webster on forewarn

Rhyming Dictionary: Words that rhyme with forewarn

Thesaurus: All synonyms and antonyms for forewarn

Spanish Central: Translation of forewarn

Nglish: Translation of forewarn for Spanish Speakers

Comments on forewarn

What made you want to look up forewarn? Please tell us where you read or heard it (including the quote, if possible).


very full or close together

Get Word of the Day daily email!

Test Your Vocabulary

What did you just call me?! A Quiz

  • rows-of-various-emoji
  • If a member of the audience describes your speech as bombastic, does that person mean it is:
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!


Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!