Definition of back-ordered
: ordered for purchase or delivery but not yet available : placed on back order
a list of back-ordered merchandise The LX450 is back-ordered at many Lexus dealers.— Michael Shnayerson She looked for generic brands of the medicine, but found they were back-ordered or unavailable for purchase.— Kara Driscoll
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Merriam-Webster unabridged
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Time Traveler for back-ordered
The first known use of back-ordered was in 1901
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