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From The Collaborative International Dictionary of English v.0.48:
Overween \O`ver*ween"\, v. t. [AS. oferw[=e]nian. See Over, and Ween.] To think too highly or arrogantly; to regard one's own thinking or conclusions too highly; hence, to be egotistic, arrogant, or rash, in opinion; to think conceitedly; to presume. [1913 Webster] They that overween, And at thy growing virtues fret their spleen. --Milton. [1913 Webster]