(nonstandard) simple past tense and past participle of do

Back to back.

A move in square dancing in which two dancers face each other, then step forward and left until they have right shoulders adjacent, then move to a position where they are back to back, then move to have left shoulders adjacent, then return to facing each other.

(US, colloquial, usually childish) Excrement, feces, dung.

plural of do do

(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.

(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.

The cardinal number occurring after el and before do one in a duodecimal system. Written 10, decimal value 12.

(rare) Abbreviation of ditto.