There is no single, conventional definition of a phraseological unit (FU) that is recognized by different linguistic schools. It is possible, however, to deduce most of the key properties characterizing a phraseological unit: it contains multiple words, is of stable, idiomatic and figurative nature, whereas the meaning is not a composition of the constituent expressions. The above-mentioned characteristic lead to conclusion that, to be considered a phraseologism, the group of words should have at least 2 lexemes; be commonly used and referred to; possess a stable lexico-grammatical form; exclude change in the order of the elements; be characterized by a partial or complete reinterpretation of the components and have a figurative platform.
