To melt a metal, especially so that it can be remade into something else.
Melt-down Sentence Examples
to melt down very pure iron for the manufacture of the best kinds of steel, such as fine tool and spring steel, and to bring the molten metal simultaneously to the exact composition and temperature at which it should be cast into its moulds.
colored pencils a melt-down of.
Fondant is a great choice for outdoor receptions because it doesn't melt down in the heat or humidity.
Or are they afraid you're about to melt down?
In a household that is already filled with clutter, this can create a complete melt down situation for many parents that is nearly impossible to conquer.