enter on

enter on idiom
Also, enter upon. Set out, begin, as in We are entering on a new era, or They entered upon the most difficult part of the research. [Early 1600s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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