idiom

This paper surveys the problem of multiword expressions (MWE), which plays the important role in development of large-scale, linguistically sound natural language processing technology. Multiword expressions are expressions which are made up of at least 2 words and which can be syntactically and/or semantically idiosyncratic. This category includes such constructions as compound nouns, idioms and phrasal verbs.This paper deals with modern approaches to MWE stratification, extraction and identification.