noun
a person who escorts people to their seats, especially in a theater or at a wedding
verb
to signal the arrival of something new or significant
preposition
used to indicate the beginning or introduction of something
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The new policy is expected to usher in a period of economic growth.
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The new teacher will usher in a fresh perspective on the subject.
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The DJ's latest hit song is going to usher in a whole new vibe to the party.
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The changing of the seasons will usher in a time of reflection and renewal.