Письмо до востребования, требования трудящихся и непотребные женщины (об эволюции значений некоторых слов с корнем треб-/*terb- в русском языке)

The report is devoted to the corpus-based (the Russian National Corpora) study of Russian lexemes with the morphological root треб-/*terb- as востребован 'demanded, claimed' and another. In modern Russian, however, the original meaning of keyword was extended to acquire the wider meaning (for example: demanded profession). In our study we would like to demonstrate what processes go on during its actualization in idiomaticity in the case of collocations. Collocations that include this keyword are a special phraseme type with a low level of idiomacity. The comprehensive research shows, that it's necessary to study how the hidden component of the meaning takes place in the "naive mind".