Ł–l merger (Polish: bylaczenie) is a phonological change in northeastern dialects of the Kashubian language, a merger of Ł into L.[1] The Polish-language term is derived from the pronunciation of the words "béł", "bëła" (Polish: "był", "była", English: "was") as "bél", "bëla".[2] The corresponding group of dialects is called Polish: gwary bylackie.
The merger is attributed to the historical language contact with Low German being more intensive than with Polish compared to other Kashubian dialects.[1]