1. something that signals or foreshadows what is to come

1. to be a sign that something will happen soon
Usage: formal

Examples

• Dark clouds are often a harbinger of storms.
• The robin’s song was a harbinger of spring.
• Rising unemployment may harbinger economic trouble.
• Her cough was a harbinger of the illness to come.
• The new technology harbingers major changes in the industry.
• Falling leaves are nature’s harbinger of autumn.
• The diplomat’s visit harbingered improved relations between the countries.