Dictionary

A party, celebration, social function.

Example: We’re having a bit of a do on Saturday to celebrate my birthday.

A hairdo.

Example: Nice do!

Something that can or should be done (usually in the phrase dos and don'ts).

A deed; an act.

(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 syllable used in solfège to represent the first and eighth tonic of a major scale.

As said before, likewise.