I. verb
1.
to turn from an upright or level position
the embarrassed boy backed into the table and overturned a lamp
Synonyms: knock over, overset, overthrow, tip (over), topple, turn over, upset
Related Word: capsize, keel (over or up), upend, upturn; prostrate; down; roll (over)
Contrasted words: erect, right, set up, straighten (up)
2.
Synonyms: overthrow 2, overset, topple, tumble, unhorse
II. noun
Synonyms: shake-up , reorganization, revolution, turnover