What is the meaning of Overturn?

To turn over, capsize or upset.

To overthrow or destroy.

To reverse (a decision); to overrule or rescind.

To diminish the significance of a previous defeat by winning; to make a comeback from.

To undergo a limnic eruption, where dissolved gas suddenly erupts from the depths.

A turning over or upside-down; inversion.

The overturning or overthrow of some institution or state of affairs; ruin.

Source: wiktionary.org