is an english saying. If you are CLOSE to getting caught by someone or hit by something but you don't actually get hit or caught you say "that was a close one" so if someone threw a ball at you and it was about to hit you but it didn't and you dodged it you would then use the term "that was a close one"
by Galuzzina February 11, 2016
To keep to oneself, to be secretive, to be very cautious in one's dealing with people and giving nothing much or nothing at all away. (As if one were playing cards and not permitting anyone to see any of the cards.)
"He is very cautious. He plays his cards close to his chest."

"You seem to be playing your cards close to your vest."

"Roy likes to play his cards close to his chest"

"To play one's cards close to one's chest is not nice etiquette"
by aussieboy322 June 6, 2009
Insinuating that a man has had or been close to having a homosexual encounter, derogatory.

Usually referring to the male anatomy, or related encounters.

Not commonly understood the first time, timing, setting, and general audience increases effect. Such as a bar surrounded by semi-lucid people. Used similarly but not same as, that's what she said.
by The other Agent August 26, 2010