stopwatch
noun /ˈstɒpwɒtʃ/
/ˈstɑːpwɑːtʃ/
- a watch that you can stop and start by pressing buttons, in order to time a race, etc. accurately, or an app on a phone that can perform the same function
（赛跑等计时用的）秒表，跑表， 码表