The Collaborative International Dictionary of English v.0.48:

Harbinger \Har"bin*ger\, v. t. [imp. & p. p. Harbingered
   (h[add]r"b[i^]n*j[~e]rd); p. pr. & vb. n. Harbingering.]
   To usher in; to be a harbinger of. "Thus did the star of
   religious freedom harbinger the day." --Bancroft.
   [1913 Webster]