Definition of forewarn verb from the Oxford Advanced American Dictionary

 

forewarn

 verb
verb
NAmE//fɔrˈwɔrn//
 
[often passive]forewarn somebody (of something)forewarn somebody that…(formal)Verb Forms present simple I / you / we / they forewarn
 
he / she / it forewarns
 
past simple forewarned
 
-ing form forewarning
 
 
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  • to warn someone about something bad or unpleasant before it happens The commander had been forewarned of the attack.
  • Idioms
    forewarned is forearmed(saying)
     
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    if you know about problems, dangers, etc. before they happen, you can be better prepared for them
    forewarning
     
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    noun [uncountable, countable]
    See the Oxford Advanced Learner's Dictionary entry: forewarn