| 1 | English | buck | A male deer, antelope, sheep, goat, rabbit, hare,... |
| 2 | Middle English | bukke | male goat; male deer or roe |
| 3 | Old English | būc | belly, stomach; belly, stomach, pitcher; belly,... |
| 4 | Proto-West Germanic | *būk | — |
| 5 | Proto-Germanic | būkaz | belly, abdomen; body |
| 6 | Proto-Indo-European | bʰōw- | to inflate, swell; to swell, grow, thrive, be,... |