(ku), n. [ OF. coue, coe, F. queue, fr. L. coda, cauda, tail. Cf. Caudal, Coward, Queue.] 1. The tail; the end of a thing; especially, a tail-like twist of hair worn at the back of the head; a queue. 2. The last words of a play actor’s speech, serving as an intimation for the next succeeding player to speak; any word or words which serve to remind a player to speak or to do something; a catchword. “When my cue comes, call me, and I will answer. Shak.” 3. A hint or intimation. “Give them [the servants] their cue to attend in two lines as he leaves the house. Swift.” 4. The part one has to perform in, or as in, a play. “Were it my cueto fight, I should have known it Without a prompter. Shak.” 5. Humor; temper of mind. [Colloq.] Dickens. 6. A straight tapering rod used to impel the balls in playing billiards.