\O`ver*ween"\, v. t. [AS. oferw?nian. 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.                            --Milton.