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by request

by request idiom

Also, on or upon request. In response to being asked to do something. For example, The band is playing our favorite song by request. This usage replaced at request. [Late 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.