O`ver*ween" (?), v. t. [AS. oferwnian. See Over, and Ween.]
To think too highly or arrogantly; to regard one's own thinking or conclusions too highly; hence, to egotistic, arrogant, or rash, in opinion; to think conceitedly; to presume.
They that overween,
And at thy growing virtues fret their spleen.
© Webster 1913.