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general::
Phrase(s): (I) never heard of such a thing!
an expression of amazement and disbelief. (Compare this with Well, I never!) • Bill: The company sent out a representative the same day I called to examine the new sofa and see what the problem was with the wobbly leg. Jane: I’ve never heard of such a thing! That’s very unusual. • Bill: The tax office is now open on Sunday! Sue: Never heard of such a thing!
McGrawhill's American Idioms And Phrasal Verbs