| Word form | kusaru |
| Original script | 腐る |
| LWT meaning(s) | |
| Analyzability | unanalyzable |
| Age | Late Old Japanese [21] (794–1185) |
| Lexical stratum | wago |
| Year | 新撰字鏡（around 900） |
| Comparison with Korean | Class 1: (’stinking’): K koli- < *kušya-. Another, less close, K cognate would be kuc- < MK kuc- ’be nasty, bad’, which would yield *kutsa- as proto-form. (222, cf. kusai; kuso) |
| Register | General |