To overturn or upset something. The strong wind overset the small boat in the lake.
To disturb or unsettle someone emotionally or mentally. The unexpected news overset her, leaving her in tears.
To set (text) in type in excess of what can be accommodated in the allotted space. The layout artist overset three lines that had to be deleted before print.
Archaic: To translate a text from one language into another. In 1623 he overset the work from Latin into English.