경주나 작업 따위의 소요 시간을 정밀하게 측정하기 위해 시작, 정지, 재설정 기능을 갖춘 시계.
A handheld timepiece designed to measure the amount of time that elapses between its activation and deactivation.
예문:
"The coach used a stopwatch to record the sprinter's hundred-meter dash time."
"She pressed the button on her digital stopwatch as soon as the chemical reaction began."
"A mechanical stopwatch is often preferred by collectors for its intricate internal gears."