Proto-Altaic: *pūsa
Meaning: outside, exterior
Russian meaning: внешний, наружний
Comments: Turk. *baĺ(č)ka 'other' is very similar, but phonetically unclear. Another irregularity is the tonal discrepancy between TM and Kor.-Jpn. (note that the TM reconstruction is not quite certain: one should perhaps reconstruct *pubuski because of the Even form, and either separate the TM form from the rest or suppose a form with a cluster like *pubsa). On the whole, a tempting but not quite secure etymology.
