Old English lagu, from Old Norse lag 'something laid down or fixed', of Germanic origin and related to lay.日耳曼？？？直接来源是挪威语，源头是日耳曼语。那它的本义是什么？before 1000; Middle English law (e), lagh (e), Old English lagu < Old Norse *lagu, early plural of lag layer, stratum, a laying in order, fixed tune, (in collective sense) law; akin to lay (v.).

Old English lagu (plural laga, comb. form lah-) "law, ordinance, rule, regulation; district governed by the same laws," from Old Norse *lagu "law," collective plural of lag "layer, measure, stroke," literally "something laid down or fixed," from Proto-Germanic *lagan "put, lay" (see lay (v.)).