Meaning of the word "do someone a good turn" in English

What does "do someone a good turn" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

do someone a good turn

US /duː ˈsʌm.wʌn ə ɡʊd tɜːrn/
UK /duː ˈsʌm.wʌn ə ɡʊd tɜːn/

Idiom

to do something helpful or beneficial for someone

Example:
She really did me a good turn by lending me her car when mine broke down.
I hope I can do you a good turn someday.