indulge: [17] The -dulg- of indulge may be related to such words as Greek dolikhós and Russian dólgij, meaning ‘long’. In that case Latin indulgēre, the immediate source of the English word, may to begin with have signified ‘allow long enough for’. Its only recorded senses, however, are the same as those of modern English indulge. [indulge etymology, indulge origin, 英语词源]