stopwatch
US /ˈstɑːp.wɑːtʃ/
UK /ˈstɑːp.wɑːtʃ/

1.
秒錶
a watch with a button that starts or stops the movement of the hands, used for measuring the time taken by an event
:
•
The coach used a stopwatch to time the runners.
教練用秒錶給跑步者計時。
•
He clicked the stopwatch to begin the experiment.
他按下秒錶開始實驗。