OVERTURN: значение слова

I.
Date: 13th century
transitive verb to cause to turn over ; upset ,

2. invalidate , destroy , reverse 2a , intransitive verb upset , turn over ,

II. noun
Date: circa 1592
the act of overturning ; the state of being overturned, the sinking of surface water and rise of bottom water in a lake or sea that results from changes in temperature that commonly occur in spring and fall