(UK, informal) A party, celebration, social function; usually of moderate size and formality. / (informal) Clipping of hairdo. / (chiefly fossilized) Something that can or should be done.

(rare) Abbreviation of ditto.

(auxiliary) A syntactic marker in a question whose main verb is not another auxiliary verb or be. / (auxiliary) A syntactic marker in negations with the indicative and imperative moods.

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

(military) Initialism of date of service. / (military) Initialism of date of separation. / (computing, Internet) Initialism of denial of service. / (sciences) Initialism of density of states.

(computing, historical) Acronym of Disk Operating System, a family of disk-based operating systems. / (US) Initialism of Department of State.

(music) plural of do

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.

A fuss made over something. / A task that has been noted as one that must be completed, especially on a list.