to relax after stress or work; to untangle or unroll something that was wound up.
From Old English 'un-' (to reverse) plus 'wind' (to coil). It literally means to reverse the winding process, but came to mean psychological relaxation as a metaphor.
Your body's parasympathetic nervous system—your 'unwind' system—is activated by specific triggers like deep breathing and warmth, which is why hot baths and slow music actually work physiologically, not just psychologically.
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