ashpan noun3 •A container beneath a boiler's furnace, catching ash and clinker that falls through the firebars •A container that fits below the grate of a domestic fireplace. •A large pan below the grate and firebox of a steam locomotive.They have been fitted with a complete rocking grate and a hopper ashpan so that the ashes can be released without the necessity for a man to go underneath the engine. — 1944 formsashpans