(transitive, intransitive) To follow urgently, originally with intent to capture or harm; to chase.

(transitive) To follow, travel down (a particular way, course of action etc.).

(transitive) To aim for, go after (a specified objective, situation etc.).

(transitive) To participate in (an activity, business etc.); to practise, follow (a profession).

(intransitive) To act as a legal prosecutor.

(transitive, somewhat archaic) To continue; to carry on.