"to melt, melt down," is used in the Passive Voice in 2 Peter 3:12 , "shall melt" (lit., "shall be melted"), of the elements (Eng., "thaw" is etymologically connected).
Note: In verse 10, the AV "shall melt" represents the verb luo, "to loosen, dissolve" (RV, "shall be dissolved," Passive Voice); so in vv. 11,12.