cue (v.) Look up cue at Dictionary.com
1928, from cue (n.1). Related: Cued, cueing.
cue (n.1) Look up cue at Dictionary.com
"stage direction," 1550s, from Q, which was used 16c., 17c. in stage plays to indicate actors' entrances, probably as an abbreviation of Latin quando "when" (see quandary) or a similar Latin adverb. Shakespeare has it as both Q and cue.
cue (n.2) Look up cue at Dictionary.com
"billiard stick," 1749, variant of queue (n.). Cue ball first recorded 1881.