Question

what is the meaning of the foreign expression in bold? a study of more than six thousand lawyers in 2014 discovered that the more hours lawyers worked pro bono, the happier they were; on the other hand, the more billable hours they worked, the less fulfilled they were. free of charge at a higher rate without supervision professionally

Explanation:

"Pro bono" is a Latin term commonly used in legal - related contexts to mean providing services free of charge. In the context of lawyers, pro bono work refers to legal services they offer without receiving payment.

Answer:

free of charge