on request

on request idiom
When asked for, as in The agreement states that the rights on this book revert to the author on request. [c. 1800] Also see by request.

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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