Езиково взаимодействие в един таен говор (говора на слепците-просяци от село Добърско, Разложко)

The article is an etymological study of the vocabulary of a secret language used by beggars in the village of Dob{\u a}rsko, Razlog district. The author is the first scholar to have recorded this jargon, its specific functional transformation into a jargon of the male population having prevented its study hitherto. The etymological analysis reveals interaction between neighbouring Balkan languages mainly. Most of the loan-words have changed in accordance with the phonetic and word-formational rules of the locally spoken dialect. Some of them have undergone semantic modifications, too.