Answer:
The first meaning is specific to wine and spirits.
Rather than pour red wine immediately, we open the bottle and allow it to rest a few minutes, then carefully decant it into the table carafe. Slow, careful decanting is essential with old wine to avoid pouring the sediment.
Another meaning is to empty out slowly and carefully.
Following a detailed plan, we will decant the classes from the Wilcox High main building into portables, and then begin the complete remodeling of the old building.