Etymology of the exclamation 「よし」


What is the etymology of the exclamation 「よし！」?

I mean the one that's made before people decide to take some kind of action
(such as standing up, or starting to do the dishes).




It's from 良し, which is the dictionary form of 良い ("good") in classical
Japanese. It's just like saying "Good" or "Okay" before making a decision in
English. よし is now considered a lexicalized interjection, but 良し is still used
in modern Japanese in the sense of "excellent".




It's from 良し, which is the dictionary form of 良い ("good") in classical
Japanese. It's just like saying "Good" or "Okay" before making a decision in
English. よし is now considered a lexicalized interjection, but 良し is still used
in modern Japanese in the sense of "excellent".

