harbinger:1

noun
har*bin*ger \ ˈhär-bən-jər \
14th century{ds||2||}
  • something that foreshadows a future event : something that gives an anticipatory sign of what is to come
  • one that initiates a major change : a person or thing that originates or helps open up a new activity, method, or technology : pioneer
  • a person sent ahead to provide lodgings

harbinger:2

verb
harbinger \
1646
  • to give a warning or prediction of : to be a harbinger of
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