unthaw v 1: become or cause to become soft or liquid; "The sun melted the ice"; "the ice thawed"; "the ice cream melted"; "The heat melted the wax"; "The giant iceberg dissolved over the years during the global warming phase"; "dethaw the meat" [syn: {dissolve}, {thaw}, {unfreeze}, {unthaw}, {dethaw}, {melt}]