A semantically or syntactically significant expression that consists of multiple words that expresses a single concept. Multiword expressions can be phrasal in nature, comprising several sentence elements, for example: 'kick the bucket'. When compared to a regular sequence of words, multiword expressions does not decompose the meaning of each lexical unit in the phrase. For example, 'pass the buck' is a multiword expression with a single concept, whereas 'pass the salt' is a regular occurrence of three single lexical units. See also compound word, solid compound.