When you unwind, you relax after you have done something that makes you tense or tired.
双语例句
例：
It helps them to unwind after a busy day at work.
这有助于他们在一天繁忙的工作后放松一下。
2.?[I 不及物动词] 解开
If you unwind a length of something that is wrapped around something else or around itself, you loosen it and make it straight. You can also say that it unwinds.
双语例句
例：
One of them unwound a length of rope from around his waist.