(Australia, colloquial) To ride two on a horse, bicycle etc.

plural of double fault

(slang) Synonym of double dildo

(US) A long-handled sledgehammer used with both hands

(freestyle skiing) an aerialist maneuver consisting of a backflip in conjunction and simultaneous with two complete twists

plural of double jack

(engineering, of a machine) Driven through twofold compound gearing, to increase the force or speed.

(music) A double whole note.

plural of double whole

(music) breve