An order that cannot be currently filled or shipped, but is requested nonetheless for when the item becomes available again.

To treat as a back order.

(chemistry) A form of titration in which an excess of standard reagent is added and then the reverse of the normal titration is carried out

simple past tense and past participle of scale back

present participle of scale back

To make a reduction in the amount, extent, etc. of something.

Third-person singular simple present indicative form of scale back

Back and forth; from one place to another and back again.

(chiefly African-American Vernacular, Yorkshire, nonstandard) Alternative form of back in the day

plural of back vowel