1. plural of stopwatch; handheld timepieces that can be started and stopped to measure elapsed time precisely

Examples

• The coach handed out stopwatches to time the runners.
• We used digital stopwatches to measure reaction times in the experiment.
• The referees synchronized their stopwatches before the race began.
• She collected vintage stopwatches as a hobby.
• The laboratory had several precision stopwatches for timing chemical reactions.
• Athletes often train with stopwatches to track their performance.