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Phrase(s): What can I say?
Inf. I have no explanation or excuse. What do you expect me to say? (See also What do you want me to say?) • Bill: Why on earth did you lose that big order? Sally: What can I say? I’m sorry! • Bob: You’re going to have to act more aggressive if you want to make sales. You’re just too timid. Tom: What can I say? I am what I am.
McGrawhill's American Idioms And Phrasal Verbs