harbinger

A harbinger is something that comes before and that shows what will follow in the future. The robin is a harbinger of spring––its presence means spring is coming soon.

The appearance of a ghost is often thought of as a harbinger of death. Middle English herbergere is from Old French herbergeor "host," from herberge "camp, shelter," a word ultimately borrowed from a Germanic language.

Definitions of harbinger
1

n something that precedes and indicates the approach of something or someone

Synonyms:
forerunner, herald, precursor, predecessor
Type of:
indicant, indication
something that serves to indicate or suggest

v foreshadow or presage

Synonyms:
announce, annunciate, foretell, herald
Type of:
tell
let something be known