what is the correct way to use the word "backorder" in English?

I know what the word means, but I’m unsure how to use it in a sentence. In my native language, Danish,“backorder” translates to “Restordre” and when something is unavailable, we say it’s"i Restordre",which translates directly into English as “in backorder”, but I’m not sure that’s correct English. Do English...