Definitions

1. noun

a portable electronic device used to measure time intervals, typically with a display showing hours, minutes, and seconds, and often with a button to start, stop, and reset the time.

“She used her stopwatch to time her run and improve her performance.”

2. verb

to measure or record the time taken for something to happen, especially using a stopwatch.

“They stopped the timer and stopwatch to see how long it took to complete the task.”