(teaching) Director of Studies; someone in charge of the academic side of a school including training teachers and deciding course materials.

(transitive, computing, Internet) To commit a denial-of-service attack against.

(transitive, colloquial) To kill or end. / (transitive, colloquial) To exhaust, to tire out. / (transitive, colloquial) To damage or injure.

(grammar) a direct object / (US) a Doctor of Osteopathic Medicine / (sciences) dissolved oxygen / (dentistry) Initialism of disto occlusal.

plural of doing / regular activities / social events / (Australia, vulgar, dated) sewage.

Used other than figuratively or idiomatically: see will, do. / (by ellipsis) Affirmative yes in response to an especially personal or direct request for the performance of some action.

Used directly after the verb have or have got. / Used after the verb have or have got and a pronoun or determiner. / Used after a pronoun or determiner without the verb have or have got.

present participle of do it

present participle of do in

(informal, usually used with right/well or wrong/ill) To perform on behalf of someone or with someone in mind; to behave in a manner befitting someone.