(sports) A game played between two teams, each consisting of a female and a male.

(law) The act of trying someone twice for the same offense, especially after an acquittal in the first trial.

(military) A fast marching pace of 180 steps per minute, 36 inches in length for the Marine Corps and Navy, 30 inches in length for the Army. It is not really double the speed of quick time as quick time is 112-120 steps per minute.

(physics) A characteristic of the transition of a system or process from regular motion to chaos, in which the period of one of its parameters is seen to double.

(rhetoric, usually derogatory) A phrase including two negative words (no, not, never, etc.) especially when used as intensifiers in informal English.

Alternative spelling of double-trouble

A very troublesome object or person.

(tennis) The missing of both the first serve and second serve, resulting in a point for the receiver.

Two feature-length motion pictures being shown back-to-back in a movie theatre, available to view for the price of a single ticket.

(US, numismatics) A gold coin with a face value of $20 formerly used in the United States, the double of the US eagle coin.