出典:Wiktionary
Perhaps from law because the practice was ordained by law. Few dictionaries comment directly on the etymology of the sense, but several (which also spell the infinitive law) group it with the other verb and noun senses derived from 古期英語 lagu (“law”).[1][2]
lawe (三人称単数 現在形 lawes, 現在分詞 lawing, 過去形および過去分詞形 lawed)
lawe (countable かつ uncountable, 複数形 lawes)