<span class="searchmatch">Proto</span>-West Germanic *þiustrī (“dark, gloomy”). See there for further connections. *<span class="searchmatch">tuskъ</span> m fog, darkness * -ъmь in North <span class="searchmatch">Slavic</span>, -omь in South <span class="searchmatch">Slavic</span>...
Or, perhaps from <span class="searchmatch">Proto</span>-Germanic *þiustrijaz, *þiuhstrijaz, from <span class="searchmatch">Proto</span>-Indo-European *tewh₂- (“to swell”). Compare <span class="searchmatch">Proto</span>-<span class="searchmatch">Slavic</span> *<span class="searchmatch">tuskъ</span> (“gloom”). *þiustrī...
*moknǫti, *močiti, *moča *mokrъ, *mokriti *mъzgnǫti, *mъždžiti *slota *tǫča *<span class="searchmatch">tuskъ</span> *tъska *bezdъždžь *bezdъždžьje *bezdъždžьnъ *dъždžati *dъždževica *dъždževьnica...