This expression does not fit modern usage.
He is knowledgeable about English grammar and usage.
ku-adjective nominalization; ku-nominalization
irony; rhetorical question
word usage; terminology
euphemism
idiomatic usage
Sino-Japanese compound of 語 (word, language) and 法 (method, rule). The term was coined in the Meiji period as a translation of Western linguistic concepts such as 'usage' or 'diction'.