1. to remove items from a stack or pile
2. to take apart or disassemble something that was stacked

Examples

• Please unstack the chairs after the meeting.
• The workers began to unstack the boxes from the truck.
• She carefully unstacked the dishes from the dishwasher.
• We need to unstack these books and sort them by subject.
• The movers will unstack the furniture once they reach the new house.
• He unstacked the papers to find the missing document.