Verb
play it cool (third-person singular simple present plays it cool, present participle playing it cool, simple past and past participle played it cool)
(idiomatic) to act cool
There's no way to play it cool when you meet Paul McCartney. You just start sweating; you trip over your words. Everyone kind of reverts back to being a 10-year-old girl. You can't help it. He's one of the only people on planet Earth that everyone knows who he is. Everyone. Rob Huebel
I remember my first test in F1. After five laps, I came back to the pits and tried to play it cool - 'Oh yeah, I'm fine, I'm on top of this' - but I was completely lost. Sebastian Vettel