Answer: harbinger \HAHR-bun-jer\ noun. 1 : one that initiates a major change : a person or thing that originates or helps open up a new activity, method, or technology : pioneer. 2 : something that foreshadows a future event : something that gives an anticipatory sign of what is to come.
Harbinger in a Sentence:
Everyone knows the groundhog is the harbinger of a change in seasons. ...
Whenever I see clouds, I know they are a harbinger of an approaching storm. ...
The surprisingly chilly day in September is a harbinger of all that winter has to offer.
Hope this helps.......... Stay safe and have a Merry Christmas!!!! :D