be/get out of practice

US /biː/ɡɛt aʊt əv ˈpræk.tɪs/
UK /biː/ɡɛt aʊt əv ˈpræk.tɪs/
"be/get out of practice" picture
1.

腕が落ちる, 勘が鈍る

to be or become less good at doing something than you were, because you have not done it for a long time

:
I used to play the piano really well, but I'm a bit out of practice now.
以前はピアノがとても上手でしたが、今は少し腕が落ちました
After not driving for a year, I really got out of practice.
1年間運転しなかったので、本当に腕が落ちました