Breaking point, melting point, boiling point, its all the same thing, really.
It's the point to which a material cannot withstand being affected by external, internal or extreme factors alike.
It's the point in which a material begins to change its form, twisting and turning, conforming to the will of the factors influencing said change.
The point in which the change is inevitable, the point of overflow, affecting even living beings, human beings.
The breaking point. The meltdown...