To become completely still, not moving. The phrase "turn to stone" typically means to become motionless, rigid, or unresponsive. It can also refer to becoming emotionally numb or unfeeling. The phrase has its origins in Greek mythology, where the Gorgon Medusa was said to have the power to turn anyone who looked at her into stone. In this context, "turning to stone" meant to become petrified, frozen, and unable to move. In a more metaphorical sense, "turning to stone" can refer to becoming emotionally or mentally rigid, closed off, or unresponsive. For example, a person might be said to have "turned to stone" if they have experienced trauma or emotional distress that has left them numb or unfeeling. The phrase can also be used to describe a situation where a person or group of people becomes unresponsive or unwilling to change their views or actions. For example, a team that is stuck in their ways and resistant to change might be said to have "turned to stone" in terms of their ability to adapt and evolve. Overall, the phrase "turn to stone" implies a sense of rigidity, immobility, and unresponsiveness. It can refer to becoming physically or emotionally petrified, and it can also describe a situation where a person or group is unwilling or unable to change or adapt.

To cause something to become stone.

To metamorphosise into stone.