This document discusses multi-word items in English, including:
1. Collocations, idioms, and other multi-word items are semi-fixed phrases that native speakers have internalized as single choices.
2. Multi-word items consist of sequences of two or more words that form meaningful and inseparable units through processes of fossilization and word formation.
3. Types of multi-word items include compounds, phrasal verbs, idioms, fixed phrases, and prefabs. Models categorize multi-word items based on their semantics and syntax.