nugara

Etymology
Compare 🇨🇬; the Latvian term apparently underwent an irregular sound shift n- > m-, based on the existence of 🇨🇬, which was borrowed from Baltic. Further etymology outside of Baltic unclear, owing to the words' strange phonetic structure, as well as the Lithuanian term's fixed (columnar) accent.

These words have been compared to, as words for "back" are often related to landscape terms. However, this connection could only hold if the Baltic and Slavic terms are independently borrowed from a common substrate language, since regular sound changes are not observed.

Endzelins alternatively assumes a proto-form, which he tentatively connects to 🇨🇬, 🇨🇬, which appear to be related to 🇨🇬.

Noun

 * 1)  back
 * nùgaros  - back pain