بواسطة عذر في المكلف
Through an excuse affecting the legally responsible person.
This qualification means that rukhsah applies to a specified condition; it does not abolish the baseline ruling for everyone. Coercion and necessity are important illustrations. In one, another person exerts severe pressure; in the other, a person faces a danger in which survival may require an otherwise prohibited substance.
Two outwardly similar acts may have different legal statuses if one person has a recognized excuse and the other does not. Yet not every inconvenience creates the same concession: the type of excuse matters.