Wiktionary
vb. (present participle of usher in English)
WordNet
n. the introduction of something new; "it signalled the ushering in of a new era"
Usage examples of "ushering in".
Carl Sagan had been a conventional antimilitary liberal, and so assumed that a radio message from space would shock humanity, damping down wars and ushering in a cosmic sense of cooperation between nations.
Ronald Reagan is inaugurated as the fortieth president of the United States, ushering in an era of conspicuous consumption and more sequins than have been seen since thirteenth-century Venice.
Lord Oda had ordered the gunners to fire in volleys when the enemy drew near, thus overcoming the arquebus's inherent disadvantages-short range and long loading time-and ushering in a new era of warfare.
Zor, the Tirolian scientist who had sent the SDF-1 to Earth, unwittingly ushering in the near destruction of the planet, the eclipse of the Human race.
Earthlings had thus far proved themselves an aggressive lot: firing on the Masters when they had first appeared and goading them into further exchanges, as if intent upon ushering in the doomsday the Zentraedi had been unable to provide.