melt

sense 1: reduce or cause to be reduced from a solid to a liquid state, usually by heating; "melt butter"; "melt down gold"; "The wax melted in the sun"
melt run melt_down

sense 2: 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"
thaw unfreeze unthaw melt

sense 3: become more relaxed, easygoing, or genial; "With age, he mellowed"
mellow melt mellow_out

sense 4: lose its distinct outline or shape; blend gradually; "Hundreds of actors were melting into the scene"
melt meld

sense 5: become less clearly visible or distinguishable; disappear gradually or seemingly; "The scene begins to fade"; "The tree trunks are melting into the forest at dusk"
fade melt fade_out