Longman Dictionary of Contemporary English homepage

forewarn

 verb
     
fore‧warn [transitive often passive]
1 to warn someone about something dangerous, unpleasant, or unexpected before it happens
forewarn somebody of/about something
We'd been forewarned of the dangers of travelling at night.
2

forewarned is forearmed

used to say that it is better to know about something before it happens, so that you can be prepared for it
—forewarning noun [uncountable and countable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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