1. a comparison of one thing against another to see how they measure up
Usage: informal
2. a traffic jam or congestion of vehicles
Usage: informal
3. an arrangement of things placed one on top of another

Examples

• How does our new product stackup against the competition?
• The stackup on the highway lasted for hours after the accident.
• There was a huge stackup of cars at the toll booth.
• The stackup of papers on his desk was getting out of control.
• Let’s see how this team’s performance stackup compared to last year.
• The morning commute created a massive stackup on the bridge.