back order

back order idiom
An item not currently in stock but to be sold or delivered when it becomes available, as in We don't have the shoes in white, but we can make them a back order. The verb back-order means “to obtain such an item,” as in The furniture store is going to back-order the sofa for us.

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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