Read this carefully and apply, if it clarified it for you:
Reserve
Funds set aside to cover future expenses, losses, or claims. To retain; to keep in store for future or special use; to postpone to a future time. A legal reserve is a monetary account required by law tobe established by insurance companies and banks as protection against losses.
A trial court reserves a point of law by setting it aside for future consideration and allowing the trial to proceed as if the question had been resolved, subject to alteration of the judgment in the event the court en banc decides the question differently.
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