society > occupation and work > materials > derived or manufactured material > metal > metal in specific state or form > [verb (intransitive)] > boil up (2)
transitive. To liquefy (metal) by heat; to melt down, cast. Also intransitive: (of metal) to become molten through heat (rare). Obsolete.
intransitive. Of liquid, esp. molten metal: to bubble vigorously as a result of boiling or the release of gases. Obsolete.