(overturns, overturning, overturned)
1.
If something overturns or if you overturn it, it turns upside down or on its side.
The lorry veered out of control, overturned and smashed into a wall...
Alex jumped up so violently that he overturned his glass of sherry...
...a battered overturned boat.
VERB: V, V n, V-ed
2.
If someone in authority overturns a legal decision, they officially decide that that decision is incorrect or not valid.
His nine-month sentence was overturned by Appeal Court judge Lord Justice Watkins.
= overrule
VERB: V n
3.
To overturn a government or system means to remove it or destroy it.
He accused his opponents of wanting to overturn the government.
VERB: V n