What Does It Mean?

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From our dictionary:
har•bin•ger

(här'bin•jur),
n.

1. a person who goes ahead and makes known the approach of another; herald.
2. anything that foreshadows a future event; omen; sign: Frost is a harbinger of winter.
3. a person sent in advance of troops, a royal train, etc., to provide or secure lodgings and other accommodations.

v.t.
to act as harbinger to; herald the coming of.