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mainly UK
to practise a skill often enough so that you do not lose the skill
经常练习(以免技艺荒疏)
I do a bit of teaching now and then just to keep my hand in.
我有时教一点书，只是不想让自己荒疏了。
I also did a bit of book reviewing to keep my hand in.
我还写了一些书评，免得自己生疏。
You should at least work part-time, just to keep your hand in.
你至少应该做一份兼职工作，免得生疏了。