Alternative form of dos a dos

plural of do-si-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.

present participle of do in

plural of do

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

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

(computing, Internet) A denial-of-service attack.

(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.