Which word describes the act of applying pressure to break or crush something?

The word "Zerdrückung" accurately describes the act of applying pressure to break or crush something. In German, "zerdrücken" means to crush, squash, or compress an object, usually resulting in its deformation or destruction under pressure. This term is specifically associated with the process of applying force to break materials down, which aligns perfectly with the context of the question.

In contrast, "Trümmer" refers to debris or rubble, which is not related to the act of applying pressure. "Kühlflüssigkeit" translates to coolant, a substance used in engines or processes to absorb heat, which does not pertain to crushing or breaking. "Gerät" means device or equipment and does not encapsulate the concept of applying pressure in any direct way. Therefore, "Zerdrückung" is the term that most accurately signifies the action described in the question.