transitive. To carry out in action, execute, or fulfil (a command, request, undertaking, threat, etc.); to carry into effect, discharge (a service…

To acquit oneself (well); also with refl. pron.

Now chiefly U.S. regional. to do one's do: to do what one has to do; to do what one can do or all that one can do.

transferred and figurative in non-physical senses. to do one's stuff: to do what is required or expected of one; to perform one's role. colloquial.