Where does “いらせらる” come from?

いらせらる (Japanese) comes from Japanese す, from Old Japanese す, from Proto-Japonic *su — nest.

Ancestry of “いらせらる”, step by step

StepLanguageWordMeaning
1Japaneseすto do; 巣 nest, hive, den; 酢 vinegar
2Old Japaneseすto do; to happen, occur; to be in a state of...
3Proto-Japonic*sunest
Every word from Proto-Japonic *su →Every word from Old Japanese す →Every word from Japanese す →