Nunberg et al. (1994) caused a shift in perspective from a monolithic view of all idioms towards a word-level approach for semantically decomposable idioms. We take that idea one step further and argue that a semantically non-decomposable idiom of syntactically regular shape can also be analyzed in terms of individual word-level lexical entries. We suggest that these entries combine according to the standard rules of syntax and that the restrictions on the syntactic flexibility of a semantically non-decomposable idiom follow exclusively from the interaction of the special semantics of these entries with the semantic and pragmatic constraints of the relevant syntactic constructions in a particular language. In our analysis, the words constituting a non-decomposable idiom make partially identical semantic contributions. We formulate our analysis in Lexical Resource Semantics (Richter & Sailer 2004).