A comic pairing in which humor is derived from the uneven relationship between two partners, usually of the same gender, age, ethnic origin and profession, but often with drastically different personalities or behavior, maybe with a stooge or straight man.

A double line, especially, a queue two persons wide.

(idiomatic) Something causing someone to do a double take.

(typography, of a character or font) Formed in a blackboard bold typeface, in which certain lines of the character are doubled

Third-person singular simple present indicative form of double-end

present participle of double-end

(rail transport) a system of operating trains with a driver at each end of the train for a fast turnaround time.

(rail transport, transitive) To operate a train with a locomotive at each end.

(railways) Having a pair of tracks in order to allow trains to pass in opposite directions.

simple past tense and past participle of double-dip