Definition
To maintain proficiency in a skill or activity through regular practice.
為了不使某項技能生疏而經常練習。
She takes on occasional translation jobs just to keep her hand in.
她偶爾接一些翻譯工作，只是為了保持技能不生疏。
He still participates in golf tournaments regularly after retirement to keep his hand in.
退休後，他仍然定期參加高爾夫球比賽以保持技能。
Although her current job is not related to programming, she still practices in her spare time to keep her hand in.
雖然她目前的工作與編程無關，但她仍然在空閒時間練習以保持技能。