| 1 | Old English | sċyld | guilt, sin, crime, offence, fault, debt, due,... |
| 2 | Proto-West Germanic | skuldi | obligation; debt; fault, blame, guilt |
| 3 | Proto-Germanic | skuldiz | obligation; debt; fault, blame, guilt |
| 4 | Proto-Indo-European | skéltis | — |
| 5 | Proto-Indo-European | sḱel- | — |
| 6 | Proto-Indo-European | ḱelh₁- | to warm up, to be hot; to warm up, be hot |