Definition of melt down phrasal verb from the Oxford Advanced Learner's Dictionary

 

melt down

 phrasal verb
phrasal verb
 
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Phrasal Verbs
to heat a metal or wax object until it is liquid, especially so that the metal or wax can be used to make something else Many of the bronze statues were melted down and used to make weapons. related noun meltdown
See the Oxford Advanced American Dictionary entry: melt down