腕が鈍る

Meaning

1. expv5r
   to become less capable

Example sentences

• 「最近、書道してないんだ」「そうなんだ。たまにはしないと腕が鈍るよ」

  "I haven't done any calligraphy recently." "Oh, really? Well, if you keep putting it off, you'll lose your touch."