Definition & Meaning of "curtain-up"

What is "curtain-up"?

Curtain-up is the moment when the curtain rises at the beginning of a theatrical performance, signaling the start of the show. It marks the transition from preparation to the actual performance, as the audience's attention shifts to the stage and the actors begin their roles. This moment sets the stage for the unfolding drama, comedy, or musical, and signifies the official start of the entertainment.