If you unwind something that is wrapped around an object, you unfasten it, and if it unwinds, it becomes unfastened.

In a nearby medical tent, a US Army doctor gently unwinds Metruk's bandage. 在附近的一个医疗帐篷里，一名美国军医轻轻解开了麦特鲁克的绷带。

to relax and allow your mind to be free from worry after a period of work or some other activity that has made you worried

A glass of wine in the evening helps me to unwind after work. 晚上一杯酒能让我在工作后放松一下。