Cue (band) definition

(1) Sports implement consisting of a tapering rod used to strike a cue ball in pool or billiards

(2) A stimulus that provides information about what to do

(3) Evidence that helps to solve a problem

(4) An actor's line that immediately precedes and serves as a reminder for some action or speech

(5) Assist (somebody acting or reciting) by suggesting the next words of something forgotten or imperfectly learned