Definition of forewarn verb from the Oxford Advanced Learner's Dictionary

 

forewarn

 verb
verb
BrE BrE//fɔːˈwɔːn//
 
; NAmE NAmE//fɔːrˈwɔːrn//
 
Verb Forms present simple I / you / we / they forewarn
BrE BrE//fɔːˈwɔːn//
 
; NAmE NAmE//fɔːrˈwɔːrn//
 
he / she / it forewarns
BrE BrE//fɔːˈwɔːnz//
 
; NAmE NAmE//fɔːrˈwɔːrnz//
 
past simple forewarned
BrE BrE//fɔːˈwɔːnd//
 
; NAmE NAmE//fɔːrˈwɔːrnd//
 
past participle forewarned
BrE BrE//fɔːˈwɔːnd//
 
; NAmE NAmE//fɔːrˈwɔːrnd//
 
-ing form forewarning
BrE BrE//fɔːˈwɔːnɪŋ//
 
; NAmE NAmE//fɔːrˈwɔːrnɪŋ//
 
 
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  • [often passive] forewarn somebody (of something) | forewarn somebody that… (formal) to warn somebody about something bad or unpleasant before it happens The commander had been forewarned of the attack.
  • Idioms
    forewarned is forearmed
     
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    (saying) if you know about problems, dangers, etc. before they happen, you can be better prepared for them
    See the Oxford Advanced American Dictionary entry: forewarn