From Wiktionary, the free dictionary
би́я (bíja, “to beat”) + -ач (-ač)
бия́ч • (bijáč) m
- fighter, combatant
- “бияч”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
- “бияч”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010