Ts–ch merger  In phonology, the ts–ch merger is the merger of the voiceless alveolar affricate and the voiceless postalveolar affricate . In Russian, it is the merger of the consonants rendered by letters Che and Tse. If the shift is towards Tse, it is called "tsokanye" (); the shift towards Che is called "chokanye" (). It is a regular sound change of Lower Sorbian, but not Upper Sorbian, as seen in the difference between Lower Sorbian and Upper Sorbian , both meaning "time". In Polish language the merger is part of a more general dialectal feature called "Mazurzenie" present in many Polish dialects, named for the Masovian dialect. It also occurs in a few areas of the Chakavian dialect of Serbo-Croatian, known as "tsakavism". The "sabesdiker losn" feature of Northeastern Yiddish includes the merger.