Ts–ch merger

 In phonology, the ts–ch merger is the merger of the voiceless alveolar affricate /ts/ and the voiceless postalveolar affricate /tʃ/.

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 (Russianцоканье); the shift towards Che is called chokanye (Russianчоканье).[1][2]

It is a regular sound change of Lower Sorbian, but not Upper Sorbian, as seen in the difference between Lower Sorbian cas and Upper Sorbian čas, both meaning "time".

In Polish language the /tʃ/ → /ts/ merger is part of a more general dialectal feature called Mazurzenie present in many Polish dialects, named for the Masovian dialect.[3]

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 /tʃ/ → /ts/ merger.

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 Metasyntactic variable, which is released under the 
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