mark out verb4 •To mark the boundaries of an area—used of land, wood, metal, etc.—before working upon it. •To classify.I don't want to be marked out as a failure. •To distinguish.The hanging-bowl lampshade in marbled glass was two decades pre-war – the kind that marked out aged people. — 1998 •To obliterate or cancel with a mark. formsmarked out · marking out · marks out