performing poorly due to a lack of practice. (*Typically: be ~; get ~; go ~.) I used to be able to play the piano extremely well, but now I'm out of practice.The baseball players lost the game because they were out of practice.
No longer used to doing something, no longer adept for lack of doing something, as in Mom hadn't baked a cake in years-she said she was out of practice. [Late 1800s] Also see in practice.