Harbinger /ˈhär-bən-jər/ noun, verb
Definition: Harbinger is used both as a noun and a verb. As a noun, it means someone or something that indicates or signals the approach of someone or something. As a verb, it is used to announce or foretell something in the future.
Harbinger can also be used to express something that is foreboding or inhibited.
Etymology: Harbinger is a word from the late 15 century, derived from the Middle English herberger “a person sent ahead to arrange for lodgings,” usually for a monarch or even an army.
In a Sentence
The dark grey clouds were a harbinger that the storm was coming on Sam’s wedding day.
The queen sent a harbinger ahead by three days to ensure lodging at the destination.
The cheery Robin song is a harbinger of spring.
Herald, Omen, Precursor, Foregoer, Forerunner
Conceal, deny, Hide, Enshroud
That is NOT using harbinger as a verb! In every example given, it is a noun.