Webster's Revised Unabridged Dictionary · 1913

Cue

Cue (kū) , noun

[ Old French coue, coe, French queue, from Latin coda, cauda, tail. Compare 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. — Shakespeare
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. — Shakespeare
5.
Humor; temper of mind. [Colloquial] — Dickens
6.
A straight tapering rod used to impel the balls in playing billiards.

Cue , transitive verb

To form into a cue; to braid; to twist.

Cue , noun

[From q, an abbreviation for quadrans a farthing.]

A small portion of bread or beer; the quantity bought with a farthing or half farthing. [Obsolete]
Hast thou worn Gowns in the university, tossed logic, Sucked philosophy, eat cues? — Old Play

The term was formerly current in the English universities, the letter q being the mark in the buttery books to denote such a portion. Nares.