What is the definition of wifely disobedience (nushuz)?

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Wifely disobedience (nushuz) is defined as the wife's transgression against the husband regarding the obedience established by God upon her. The term is derived from 'nashz,' meaning elevation, implying she has elevated herself above the obedience due to her. Signs of disobedience include being sluggish or reluctant when summoned, only complying with reluctance and murmuring.