Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Drinkslimlineslim‧line /ˈslɪmlaɪn/ adjective British English 1 DFDa slimline drink has fewer calories than the normal type → diet2 THIN PERSONSMALLa slimline piece of equipment is smaller or thinner than others of the same type a slimline dishwasher ldoceonline.com