боц

Either:

• Contracted from an earlier *bodьcь, a diminutive of Proto-Slavic *bodъ (“piercing”);
• Deverbal from бо́цам (bócam, “to poke, to jolt”), factitive from Proto-Slavic *bokъ (“protrusion”) or *bosti (“to pierce”).

боц • (boc)

1. told when poking or prodding

боц • (boc) m

1. (object noun) protrusion, bulge

   → epithet for the biggest toe of the foot

2. (action noun) jab, kick, shoot

   бия боц ― bija boc ― to strike a kick

• бо́ча (bóča, “to kiss”) (causative-iterative, dialectal)
• бо́цам (bócam, “to jolt”) (factative, colloquial)

• бод (bod, “stitch”)
• бок (bok, “flank”), бо́чница (bóčnica, “side of skirt”) (dated, dialectal)

• “боц”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
• “боц”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010
• Nayden Gerov, Тодор Панчев (1908) “боцъ!”, in Допълнение на българския рѣчникъ [Dictionary of the Bulgarian language]‎ (in Bulgarian), volume 6, Plovdiv: Печатница "Трудъ" на Петко Бѣловѣждовъ, page 32