As can be seen: Lexical bundles and disciplinary variation

An important component of fluent linguistic production is control of the multi-word expressions referred to as clusters, chunks or bundles. These are extended collocations which appear more frequently than expected by chance, helping to shape meanings in specific contexts and contributing to our sense of coherence in a text. Bundles have begun to attract considerable attention in corpus studies in EAP, although the extent to which they differ by...