out of practice
01
しばらくやっていない, 腕がなまっている
used to say that one did not have much experience with something and therefore is not very good at it
慣用句
くだけた
例
I tried playing the piano again, but I was badly out of practice.
またピアノを弾いてみたけど、しばらく弾いていないのが丸わかりだった。
