Definition of back order
: a business order yet to be fulfilled because stock is unavailable
Examples of back order in a Sentence
The book I want to buy is a back order and won't be shipped for three weeks.
The book I want to buy is on back order and won't be shipped for three weeks.
First Known Use of back order
BACK ORDER Defined for English Language Learners
Definition of back order for English Language Learners
business : a product that has been ordered but not sent to the customer because it is not yet available
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