Where does “欲す” come from?

欲す (Japanese) comes from Japanese す, from Old Japanese す, from Proto-Japonic *su — nest.

Ancestry of “欲す”, step by step

欲す traces back through two separate lines of ancestry.

via Japanese

StepLanguageWordMeaning
1Japaneseto do; 巣 nest, hive, den; 酢 vinegar
2Old Japaneseto do; to happen, occur; to be in a state of...
3Proto-Japonic*sunest

via Japanese 欲る

StepLanguageWordMeaning
1Japanese欲るto want, desire
Every word from Proto-Japonic *suEvery word from Old Japanese Every word from Japanese