fluency starts here
"I don't know about that..."
Meaning: I actually DO know about that and I disagree, don’t like it, think it’s a bad idea, or have some serious concerns about it.
Use: I say this when I am trying to be polite, kind, don’t want to hurt their feelings, or I am skeptical (suspicious) of their idea.
Pronunciation: Usually, the “I” sound is a little bit longer than usual, and the longer you stretch it, the more you disagree, disapprove, or are suspicious of the what the other person said.
"Demolition man is the best movie ever!"
"I don't know about that." (disagree)
"You should try online dating."
"Umm...I don't know about that." (disagree + don't like)
"Come on, let's sneak into the movie, so we don't have to pay."
"I don't know about that. Sounds kind of risky." (bad idea)
"Humans should only eat meat. It's the healthiest diet."
"I don't know about that. We need vegetables." (skeptical)