Ostkäslausch is a Low Prussian dialect of Low German spoken in an area of Poland, that used to be part of Germany.
Geography It used to be or is spoken in Warmia in East Prussia. Ziesemer, Walther. Die ostpreußischen Mundarten. Ferdinand Hirt, 1924, p. 137. Its border ran through Warmia.Mitzka, Walther. Grundzüge nordostdeutscher Sprachgeschichte. Elwert, 1959, p. 51 Ostkäslausch used to be spoken around Reszel and used to have borders to Breslausch, Natangian and Standard German.
It has features of Eastphalian, Westphalian and East Pomeranian dialect. Mitzka, Walther. Grundzüge nordostdeutscher Sprachgeschichte. Elwert, 1959, p. 50 Mitzka, Walther. Grundzüge nordostdeutscher Sprachgeschichte. Elwert, 1959, p. 54
The Eastern border of Ostkäslausch was the old border of Catholic Warmia to Protestant State of the Teutonic Order, it bordered to Natangian.[???]. Walter de Gruyter & Co., 1968, p. 298 It occurred, that Ostkäslausch and High Prussian were spoken in the same village.Mitzka, Walther. Grundzüge nordostdeutscher Sprachgeschichte. Elwert, 1959, p. 53
Phonology There is gutturalisation of nd and nt to ng; usually an i added (Schtuing 'hour', cf. Standard German Stunde), but not in the preterite of strong verbs (jebunge 'bound', cf. Standard German gebunden).Ziesemer, Walther. Die ostpreußischen Mundarten. Ferdinand Hirt, 1924, p. 130. Ostkäslausche also has diphthongization of e and long o after ei and ou. O frequently has become io or iu.Ziesemer, Walther. Die ostpreußischen Mundarten. Ferdinand Hirt, 1924, p. 131. Ostkäslausch has influence of High Prussian. Most cases of Natangian diphthongization of e to ei and every o to ou occur in Ostkäslausch.
Grammar It has the preterite forms kam and nam.Walther Ziesemer: Die ostpreußischen Mundarten Ferdinand Hirt, Breslau, 1924, p. 132
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