Definition
To maintain one's skill or proficiency in a sport or other activity through regular practice, preventing it from deteriorating.
经常练习以保持技艺
To keep my eye in with golf, I practice at least twice a week.
为了保持高尔夫球的熟练度，我每周至少练习两次。
He goes swimming every week to keep his eye in.
他每周去游泳以保持自己的熟练度。
Even though I don't play the piano often now, I still practice regularly to keep my eye in.
虽然我现在不常弹钢琴，但我仍然定期练习以保持熟练度。