The article discusses the issue of untranslatability at the collegiate graduate saddle lexical level considering the expansion of the meanings of root words and other elements of word formation as a result of the development of the language.Based on the borrowed words from Japan into English, as well as with the help of comparative examples of Armenian and Russian, it has been teal horse blanket revealed that the solution to the problem of untranslatability is closely related to the existence of the linguistic mechanisms which make it possible to assimilate the foreign words using the original pattern that was selected the moment the notion was created for its full expression.The article also discusses the attempts of lexicalization of the notion in the second language.