Phraseology appeared in the domain of lexicology and's undergoing the process of segregating as a separate branch of linguistics. The reason's clear – lexicology deals with words and their meanings, whereas phraseology studies such collocations of words (phraseologisms, phraseological units, idioms), where the meaning of the whole collocation's different from the simple sum of literal meanings of the words, comprising a phraseological unit. F.e. ‘Dutch auction’ isn't an aucti… (More on Phraseology)