Old English bog "shoulder, supply," longer in Old English to "twig, part" (compare limb (n.1)), from Proto-Germanic *bogaz (cognates: Old Norse bogr "shoulder," Old large German buog, German Bug "shoulder, hock, joint"), from PIE *bhagus "elbow, forearm" (cognates: Sanskrit bahus "arm," Armenian bazuk, Greek pakhys "forearm"). The "limb of a tree" feeling is unusual to English.
some of the bigger branches of a tree
- An arm or part of a tree, esp. a big arm or primary branch.
- A gallows.
(letter.) An arm or branch of a tree, esp. a large arm or primary part.
- (n.) A gallows.
For instances in the lower culture see Frazer, Golden Bough (2), i.