one day

(rare) the first day of the month

secret, key, secret trick

an effort, an endeavor

to endeavor, to make an effort

to rest / to sleep / to be absent (from) / to suspend; to be dormant

one day, 24 hours / the daytime, the period from dawn until dusk / (figuratively) a short period of time / one day, someday, an unspecified day / the first day of the month

success / success in life, achievement in the world

succeed / be successful in life

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