the least (one) can do

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the least (one) can do

Something that one ought to do; the very minimum one should do. I know you're angry with him, but he seems like he really wants to make amends. The least you can do is hear him out. A: "Thank you so much for the cookies!" B: "It's the least we can do to repay you for looking after our pets while we were away."
See also: can, least