Where does “biś” come from?
biś (Lower Sorbian) comes from Sanskrit विंशति, from Proto-Indo-Aryan HwiHśatí, from Proto-Indo-Iranian HwiHćati, from Proto-Indo-European h₁wih₁ḱm̥t, from Proto-Indo-European dwi(h₁)dḱm̥ti — two tens; two decades; twenty; two-ten.
biś (Lower Sorbian): to hit, strike, beat
Ancestry of “biś”, step by step