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It is time for something exciting, interesting, challenging, risky, etc. to begin. "It's showtime," he murmured, as he entered the ring for the boxing match. OK, guys, it's showtime! Let's show the world just how powerful our new device is!
See also: showtime
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
See It’s showtime!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.