Definition
To maintain one's skill or proficiency in a sport or other activity through regular practice, preventing it from deteriorating.
經常練習以保持技藝
To keep my eye in with golf, I practice at least twice a week.
為了保持高爾夫球的熟練度，我每週至少練習兩次。
He goes swimming every week to keep his eye in.
他每週去游泳以保持自己的熟練度。
Even though I don't play the piano often now, I still practice regularly to keep my eye in.
雖然我現在不常彈鋼琴，但我仍然定期練習以保持熟練度。