Foreshadow (verb)

1. Give an indication or a warning of (a future event).
2. Be a sign or warning of (something).

Origin:

Early 17th century: from fore- "before" + shadow.

Examples:

1. The novel foreshadows the events that happen later in the story.
2. The clouds foreshadowed a storm.
3. The speech foreshadowed the policy changes that would come later.
4. The data foreshadowed a recession.
5. The early signs foreshadowed the onset of the disease.