blow your cool

blow (one's) cool

To lose control of one's composure, temper, or nerve. He really blew his cool when the waiter dropped his food. I really blew my cool during the interview.
See also: blow, cool
Farlex Dictionary of Idioms.

blow your cool

lose your composure; become angry or agitated. informal
See also: blow, cool
Farlex Partner Idioms Dictionary
See also:
  • blow cool
  • blow one’s cool
  • blow one's cool
  • blow (one's) cool
  • blow (one's) socks off
  • blow/knock somebody's socks off
  • blow (one's) mind
  • blow someone’s mind
  • blow someone's mind
  • blow your/somebody's mind
References in periodicals archive
It is never cool "to blow your cool." It has to do with concealing rather than revealing--so shades are usually cool.
Cars and Culture: The Hirohata Merc--So Cool
Don't blow your cool by blowing your mates out at the last minute for your new man.
Mirror Woman: RELATIONSHIPS - Let's be serious; After a handful of dates with your new man, you're wondering if it's just a bit of fun or something more serious. Here's how to tell when you are officially his girlfriend
If there was ever a perfect place to blow your cool, it's Blackpool.
Holiday: READY FOR ACTION