practice law

:  carry out, apply

:  to do or perform often, customarily, or habitually

:  to be professionally engaged in

:  actual performance or application

:  a repeated or customary action

:  the usual way of doing something

:  a binding custom or practice of a community :  a rule of conduct or action prescribed (see prescribe 1a) or formally recognized as binding or enforced by a controlling authority

:  the whole body of such customs, practices, or rules

:  common law

:  litigate

:  to sue or prosecute at law