Zidarova, Vanya2024-06-052024-06-052024-04-273033-0599https://doi.uni-plovdiv.bg/handle/store/171Fixed expressions comprise a large, specific and diverse group of linguistic units which makes them a serious theoretical and lexicographical challenge. This article offers a review of the existing classifications. There is also a new model proposed – one which distinguishes between a core and a periphery. Manifestations of structural variability are also considered in two directions: in language and in speech. The observations are based on the corpus in one of the Bulgarian phraseological dictionaries.enfixed expressionsphrasemeclassificationvariationArticle