I couldn't ask you to do that

I couldn't ask you to do that

Said when one is reluctant to make a particular request or accept someone's offer to do something. Often, though, the reluctance is feigned (as to be polite), and one ultimately wants the thing done. A: "I could talk to the boss about it for you." B: "Oh, I couldn't ask you to do that—unless you really want to." It would be great if you could watch the kids for me this afternoon, but I couldn't ask you to do that.
See also: ask, that

I couldn't ask you to do that.

That is a very kind offer, but I would not ask you to do it. (This is not a refusal of the offer.) Sally: Look, if you want, I'll drive you to the airport. Mary: Oh, Sally. I couldn't ask you to do that. BUI: I'll lend you enough money to get you through the week. Sally: I couldn't ask you to do that.
See also: ask, that