english
1
general::
Phrase(s): You couldn’t (do that)! [and] You wouldn’t (do that)! an indication of disbelief that someone might do something. • Bill: I’m going to run away from home! Jane: You couldn’t! • Bill: I get so mad at my brother, I could just strangle him. Tom: You couldn’t do that!
McGrawhill's American Idioms And Phrasal Verbs