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Dunder Cap: n \’d:(n-d;(r\ perh. fr. D dondér thunder + n \kap\ ME cappe, fr. OE cæppe, fr. LL cappa head covering, cloke A contraction of dunce cap (1840) and dunderhead (1625). An idiot, numb skull, blockhead or dunce. One who does not understand the obvious results of a planned action.
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