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fore‧warn
[transitive often passive]
[transitive often passive]1 to warn someone about something dangerous, unpleasant, or unexpected before it happens
2 used to say that it is better to know about something before it happens, so that you can be prepared for it
forewarned is forearmed
—forewarning noun [uncountable and countable]

We'd been forewarned of the dangers of travelling at night.