get serious

get serious

1. To adopt a serious attitude or demeanor after having been joking or being silly. Often used as an imperative. Get serious for a minute, will you? This is not something to joke about.
2. To begin to seriously focus on something, especially after having been wasting time or procrastinating. Often used as an imperative. Your book report is due tomorrow—turn off the video games and get serious! I've been dabbling for a while, but I think it's time I got serious as a writer.
3. To realize or accept the truth; to be realistic or practical. Often used as an imperative. Oh, get serious—there's no way you got the job over the CEO's son, no matter how qualified you are.
See also: get, serious
Farlex Dictionary of Idioms.

Get serious!

Inf. Get realistic!; Stop horsing around! Oh, come on! Get serious! You don't really mean that!
See also: get
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • Get serious!
  • for serious
  • dead serious
  • serious
  • (as) straight as a ramrod
  • balloon goes up, the
  • strike a pose/an attitude
  • strike an attitude