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English word bo comes from Proto-Indo-European *bhā-, and later Proto-Germanic *bō- (A stem meaning father, brother, close male relation.)
*bhā- (Proto-Indo-European)
*bō- (Proto-Germanic)
A stem meaning father, brother, close male relation.
*baba (Old English)
babe (Middle English)
boy (English)
(transitive) to act as a boy (in allusion to the former practice of boys acting women's parts on the stage). To use the word boy to refer to someone (US, slang) Heroin. [from 20th c.]. (affectionate, diminutive) A male of any age, particularly one rather younger than the speaker. [from 17th c.]. (diminutive) A male child: a son of any age.. (historical, military) A former low rank of various [...]
bo (English)
(US, slang) Fellow, chap, boy.