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Phrase(s): melt something down
to cause something frozen to melt; to cause something solid to melt. • The rays of the sun melted the candle down to a puddle of wax. • The heat melted down the ice., Phrase(s): melt down
1. Lit. [for something frozen] to melt. • The glacier melted down little by little. • When the ice on the streets melted down, it was safe to drive again. 2. Fig. [for a nuclear reactor] to become hot enough to melt through its container. • The whole system was on the verge of melting down.
McGrawhill's American Idioms And Phrasal Verbs