the least (someone) could do

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the least (someone) could do

Something that someone ought to do; the very minimum someone should do. I know you're angry with your father, but he seems like he really wants to make amends. The least you could do is hear him out. A: "Thank you so much for the lovely card and wonderful bottle of wine!" B: "It was the least we could do after you took care of our pets while we were away."
See also: could, least