To reverse the winding or twisting of: unwind a ball of yarn.
To separate the tangled parts of; disentangle.
To free (someone) of nervous tension or pent-up energy.
Business To back off from (a stated policy or financial commitment):"The US was preparing to unwind its asset purchase programme as the economy picked up"(Elaine Moore ).
To become unwound.
To become free of nervous tension; relax: liked to unwind with a cocktail before dinner.