stopwatch

time / hour / the hours or time when something happens

to conjecture, to guess / to predict / to weigh, to measure, to estimate

to use / to employ / to make use of, to apply / to spend

a watch (portable or wearable timepiece) / a watchman, observer / a watch (person who guards, sailors or officers with common period of duty, etc.)

to observe, keep watch

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

to stop

stoppage / (music) a stop or register in an organ or similar musical instrument

(informal) stop!