English word bo comes from Proto-Indo-European *bhā-, and later Proto-Germanic *bō- (A stem meaning father, brother, close male relation.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *bhā- | Proto-Indo-European (ine) | |
| *bō- | Proto-Germanic (gem-pro) | A stem meaning father, brother, close male relation. |
| *baba | Old English (ca. 450-1100) (ang) | |
| babe | Middle English (1100-1500) (enm) | |
| boy | English (en) | (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 (en) | (US, slang) Fellow, chap, boy. |