I wouldn't hold my breath
"I wouldn't hold my breath"
-does it mean "I cant stand with it" or "I can't look forward to it"?

Question

I wouldn't hold my breath
"I wouldn't hold my breath" 
->does it mean "I cant stand with it" or "I can't look forward to it"?

Answer

It means "don't look forward to it". One more Ex: She said she'd get back to us, but don't hold your breath!

Answer

I would say it's closer to "Don't expect that to happen".  So if you're hoping your best friend will visit you but they're very very busy, someone might tell you "Don't hold your breath", meaning "Don't expect your friend to come over".

Answer

It's basically like saying, "I wouldn't count on it."