crumble dissolve flake react tarnish burn corrode heat rust erodes scour eat deteriorate decay consume corrupt rot destroy decompose bite sears engrave decline stagnate atrophy degenerate gnaw waste fret nibble spoil canker wear impair oxidise devour disintegrate undermine distress attack damage weaken liquefie exhaust dissipate melt weather reduce lessen diminishe sap discolor discolour stain blacken dull darken alter bond change flame ignite kindle scorch singes blaze char enkindle inflame fire spark enflame