*When the curtain goes up

• When the curtain rises
• When the curtain goes up?
• Start of a performance

Wikipedia Word definitions in Wikipedia
" Showtime " was the twenty-fourth (and final) episode of the first season of the American television series M*A*S*H . It originally aired on March 25, 1973.

WordNet Word definitions in WordNet
n. the time at which something is supposed to begin; "they got an early start"; "she knew from the get-go that he was the man for her" [syn: beginning , commencement , first , outset , get-go , start , kickoff , starting time , offset ] [ant: middle , end ...

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ It's five minutes to showtime and a huge roar goes up as Ice-T announces the acts. ▪ Student rush tickets are available 15 minutes before showtime . ▪ The Boston show was canceled 10 minutes before showtime because Kelly was ...