Abstract
Compared to varieties of the Northern Netherlands, Limburgish dialects are characterised by the high frequency of the postalveolar sibilants [ʃ], [ʒ] and [t͡ ʃ]. These sounds appeared in Limburgish mostly as a result of sound shifts which are shared with High and Middle German, but originated also to a smaller extent in loanwords. This contribution explains every different origin of postalveolar sibilants in the dialect of Eys (Southeast Limburg, Netherlands), thereby including its hypothesised time of appearance, its phonetic and/or phonological motivation and its relevance for linguistic research. The main findings consist of otherwise unexplainable evidence for ungrounded constraints in OT, a rare diachronic split between a fronted [s̠] and a retracted [t͡ s̠], and the blending of one Dutch and one German phonological rule into a combination of the two rules.