forewarning of the doubts and problems which may arise later.
Nightmares: Nightmares are the result of suppressing fear or they can contain a forewarning about something that is to come.
Blood types cannot be changed, but adequate forewarning allows precautions and treatments that limit the danger to unborn babies.
forewarning the shipping company P&O of impending disaster.
forewarning students planning to study abroad in 2004/05 that this change might be introduced immediately.