save the day
to do something that solves a serious problem

[TahlilGaran] Dictionary of Contemporary English ▲

save the day
to do something that solves a serious problem.
Naturally, the hero saves the day by shooting the kidnappers and rescuing the hostages just in the nick of time.

[TahlilGaran] English Idioms Dictionary ▲

save the day
to bring about victory or success (when defeat is likely)
The player saved the day for his team when he played his best game of the season.

[TahlilGaran] English Idioms Dictionary ▲

save the day
v. phr. To bring about victory or success, especially when defeat is likely.
The forest fire was nearly out of control when suddenly it rained heavily and saved the day.
The team was behind, but at the last minute Sam saved the day with a touchdown.

[TahlilGaran] English Idioms Dictionary ▲