use it or lose it
US /juz ɪt ɔr luz ɪt/
UK /juːz ɪt ɔː luːz ɪt/
成语
不进则退, 不用则废
used to say that if you do not practice or use a skill or ability, you will forget how to do it or lose the capacity to use it
示例:
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I haven't played the piano in years, and it's definitely a case of use it or lose it.
我好几年没弹钢琴了，这绝对是不进则退的情况。
•
Mental exercise is important for seniors; it's a matter of use it or lose it.
脑力锻炼对老年人很重要；这就是不进则退的问题。