1
general::
Phrase(s): carry the day [and] win the day
to be successful; to win a competition, argument, etc. (Originally meaning to win a battle.) • Our team didn’t play well at first, but we won the day in the end. • Preparation won the day and James passed his exams.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Win, prevail, as in At auctions the wealthiest bidders usually carry the day. [Late 1600s]
American Heritage Idioms