Dictionary

(auxiliary) A syntactic marker.

To perform; to execute.

Example: All you ever do is surf the Internet. What will you do this afternoon?

To cause, make (someone) (do something).

To suffice.

Example: it’s not the best broom, but it will have to do;  this will do me, thanks.

A deed or action, especially when somebody is held responsible for it.

Example: This is his doing. (= "He did it.")

The sound made by an elastic object when struck by or striking a hard object.