| 1 | English | boast | A brag; ostentatious positive appraisal of... |
| 2 | Middle English | bosten | to threaten |
| 3 | Middle English | bost | boast, glory, noise, arrogance, presumption,... |
| 4 | Anglo-Norman | bost | — |
| 5 | Proto-Germanic | bausuz | inflated; swollen; puffed up; proud; arrogant;... |
| 6 | Proto-Indo-European | bʰew- | to grow, swell; to swell, wax, grow; to blow; to... |