(aviation) The commercial rights for an airline to take off and land planes at a particular airport at a particular time.

(British spelling) plural of pair of colours

(American spelling) plural of pair of colors

(historical) A turn-out of a carriage and two horses.

(computing, programming) A software development technique, part of extreme programming, in which two programmers work together at a single keyboard, one coding while the other observes and reviews. The roles are often switched at regular intervals.

A pair of twins, one male and one female. / Two siblings, one male and one female.

(poker) Alternative form of two pair

(advertising) A technique in which two or more competing products are compared in such a manner that certain good qualities are connected, while one product is made to appear more beneficial or desirable than its competitors.

(chiefly US, colloquial, idiomatic, somewhat vulgar) To be brave; to show some courage, especially in a situation in which one has so far failed to do so.

(American spelling) A national flag and a regimental flag when carried together.