(advance) notice; preliminary announcement; warning
trailer (for a film, TV show, etc.)
映画の予告が公開された。
The movie trailer was released.
試験日の予告が一週間前にあった。
There was advance notice of the exam date a week before.
工事の予告なしに突然道路が封鎖されて困った。
The road was suddenly closed with no warning of construction, which was a problem.