Harbinger/ˈhɑːrbɪndʒər/ Definition 1 of 1Pro Tip 1/3Often Ominous Harbinger frequently suggests a negative or foreboding future event, but not always. The sighting of a lone raven is a harbinger of bad luck. Pro Tip 2/3Not Always Literal 'Harbinger' can be used metaphorically to represent an early sign of things to come. His sudden coldness was a harbinger of the breakup. Pro Tip 3/3Neutral or Positive In some contexts, harbinger can signal positive changes or beginnings. Robins are considered a harbinger of spring.