poetic license

poetic license idiom
Also, artistic license. The liberty taken by a writer or artist in deviating from conventional form or fact to achieve an effect. For example, I've never seen grass or a tree of that color; but that's artistic license. [Late 1700s]

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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