Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “warn”

See all translations

warn

verb [I or T] uk   /wɔːn/ us    /wɔːrn/
B1 to make someone realize a possible danger or problem, especially one in the future: [+ obj + to infinitive ] We were warned not to eat the fish which might give us a slight stomach upset. [+ obj + (that) ] Have you warned them (that) there will be an extra person for dinner? I was warned against/off going to the east coast because it was so full of tourists. There were signs warning of fog as soon as we got onto the motorway. This particular curry is extremely hot - be warned! Put that ball down and come over here, Laura - I'm warning you (= I will punish you if you do not)!
More examples
(Definition of warn from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of warn?
Add Cambridge dictionaries to your browser to your website

Definitions of “warn” in other dictionaries

Word of the Day

shampoo

a liquid used for washing hair, or for washing particular objects or materials

Word of the Day

The way we move (Verbs for walking and running)

by Kate Woodford,
March 25, 2015
​​​ This week we’re looking at interesting ways to describe the way that people move. Most of the verbs that we’ll be considering describe how fast or slow people move. Others describe the attitude or state of mind of the person walking or running. Some describe both. Starting with verbs for walking slowly,

Read More 

crossfit noun

March 23, 2015
high-intensity strength training Two women in strappy dresses discussed how much weight they could snatch

Read More