Picture the courtroom door swinging the other way. Someone, or something, has been brought in front of the court, and the court's answer this time is not a final decision but `go back and wait`. The person goes back to a cell, or back home under rules, until the trial day. The case goes back down to the court it came from. `Remand` is that sending-back order, and the noun is either the waiting it creates or the send-back itself.
From the word’s history
The packet traces remand through Middle English and Middle French to Late Latin remandare, built on re- (back) and mandare (to order) — literally to order something back. That is still precisely what a court does with it, whether what goes back is a person or a case.
字源資料顯示 remand 經由中古英文和中古法文，來自晚期拉丁文 remandare，由 re-（回去）和 mandare（命令）組成，字面就是「下令送回去」。command、demand 跟它同一個字根。今天法院做的事，還是這個動作：送回去的可能是人，也可能是案子。
Wiktionary, "remand"
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