melt something down

Từ điển Oxford Advanced Learner 8th

ˌmelt sthˈdown derived
to heat a metal or ↑wax object until it is liquid, especially so that the metal or ↑wax can be used to make sth else
•Many of the bronze statues were melted down and used to make weapons.
related noun ↑meltdown
Main entry: ↑melt_derived