1. a speedometer
Usage: informal
2. a tight-fitting swimsuit, especially for men
Usage: trademark; often capitalized

Examples

• The speedo showed we were going 65 miles per hour.
• He checked his speedo to make sure he wasn’t speeding.
• The swimmer wore a speedo for the competition.
• His new speedo was bright blue.
• The car’s speedo was broken and needed repair.
• Olympic swimmers often prefer speedos for reduced drag.