Definition of showtime noun from the Oxford Advanced Learner's Dictionary

 

showtime

 noun
noun
BrE BrE//ˈʃəʊtaɪm//
 
; NAmE NAmE//ˈʃoʊtaɪm//
 
[uncountable]
 
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the time that a theatre performance will begin It's five minutes to showtime and the theatre is packed. (figurative, North American English) Everybody ready? It's showtime!
See the Oxford Advanced American Dictionary entry: showtime