yumruk.

From Ottoman Turkish یومروق (yumruk, “fist”), further origin unclear. Either a derivation from Proto-Turkic *yum (“round”) (see yumak, yumru) or from Proto-Turkic *yudruk (“fist”) with secondary contamination with the former. Clauson thinks it is rather derived from *yumur-, unrecorded causative of Proto-Turkic *yum- (“to close”), in the sense of "something clenched", see yum- (“to close, clench”). Cognate to Azerbaijani yumruq (“fist”), Chagatai [script needed] (yumruq, “fist”), Turkmen ýumruk (“fist”). Compare also Old Uyghur yydrwq (yïdruq, “fist”), Karakhanid يُذْرُقْ (yuδruq, “fist”), Bashkir йоҙроҡ (yoðroq, “fist”).