to stop worrying or thinking about problems and start to relax 放松；轻松 SYN relax, wind down
Music helps me unwind after a busy day.
[T, I] ~ (sth) (from sth)to undo sth that has been wrapped into a ball or around sth 解开，打开，松开（卷绕之物）
to unwind a ball of string
解开一团绳
He unwound his scarf from his neck.
他从脖子上解下围巾。
The bandage gradually unwound and fell off.
绷带逐渐松开脱落了