This book addresses the key role of phraseology in second language acquisition and instruction. It is divided into three main sections: Extracting and Describing Phraseological Units investigates the role played by native and learner corpora in the extraction and description of multiword units, two initial and crucial steps in informing language pedagogy; Learning Phraseological Units deals with the learning aspect, an oft-neglected yet essential dimension of phraseology in second/foreign language pedagogy, this section also addresses issues in new literacies; and Recording and Exploiting Phraseological Units focuses on pedagogical tools, notably monolingual and bilingual dictionaries and textbooks. This stimulating collection presents cutting edge research in the field and identifies major avenues for future theoretical and applied work. It is of particular relevance to researchers and teachers interested in the patterned nature of language.