usher in

verb

1. To announce the arrival of something; to herald.

   “Defeat 12 months ago away to the same opponents signalled the end of John Toshack's reign as Wales manager, ushering in first caretaker Brian Flynn and then current boss Gary Speed.”

2. To begin something with preparatory material; to introduce.

   “It ushered in a whole new era.”

   “The war-torn first half of the 20th century, together with the railway grouping of 1923, ushered in further austerity in design.”