做（对某人）有利的事情
to do something kind that helps someone else
I was only trying to do her a good turn.
Tom did me a good turn earlier this year and I wanted to repay him.
A friend of mine had done me a good turn and I wanted to say thank you.
I think she thought she was doing me a good turn.
We were taught to do a good turn every day.
He once did a good turn for her and she never forgot it.
See also: good adjective (KIND)