lourPronunciation: /ˈlaʊə/ (also lower)Definition of lour verb [no object] look angry or sullen; scowl:the lofty statue lours at patients in the infirmary (of the sky or landscape) look dark and threatening. noun a scowl. a dark and gloomy appearance of the sky or landscape. Derivatives loury adjective Origin: Middle English: of unknown originlour in other Oxford dictionaries Definition of lour in the US English dictionary