plural of do-si-do

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.

Back to back.

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

(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.

plural of do

(music) plural of do

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

present participle of do

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