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English definition of “I might have known”

I might have known

disapproving
said when you are not surprised at a situation or someone's behaviour , because you expected it: I might have known (that) he'd still be in bed at noon .Planning, expecting and arrangingPlotting and trapping Grammar:MightGrammar:Might: formsGrammar:Might: usesGrammar:Might: typical error
(Definition of I might have known from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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