1.Introduction -- Part I.Multiword Expressions: a Though Nut to Crack -- 2.Definitions and Characteristics -- 3 State of the Art in MWE Processing -- Part II.MWE Acquisition -- 4.Evaluation of MWE Acquisition -- 5.A New Framework for MWE Acquisition -- Part III Applications -- 6.Application 1: Lexicography -- 7.Application 2: Machine Translation -- 8.Conclusions -- Appendixes -- A.Extended List of Translation Examples -- B.Resources Used in the Experiments -- C.The mwetoolkit: Documentation -- D.Tagsets for POS and syntax -- E.Detailed Lexicon Descriptions.