The present study reports descriptive normative measures for 245 Italian verbal idiomatic expressions. For each of the idiomatic expressions the following variables are reported: Length, Knowledge, Familiarity, Age of Acquisition, Predictability, Syntactic flexibility, Literality and Compositionality. Syntactic flexibility was assessed using five syntactic operations: adverb insertion, adjective insertion, left dislocation, passive and movement. The psycholinguistic relevance of each dimension, their measures and the correlations among them are provided and discussed. The databases are freely available for down-loading from the Psychonomic Society Web archive at www.psychonomic.org/archive/.