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disbelief

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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!

suspend disbelief

To accept as plausible something one knows to be untrue, especially the setting and plot of a drama or fiction so as to allow the appreciation of art.

See also: disbelief, suspend