芥かい子し泥でいalso: かいしでいMeanings1nounmustard plasterrare termA traditional poultice made from mustard powder; used as a folk remedy. Rare term.昔むかしは風邪かぜをひくと芥子からし泥でいを胸むねに貼はったものだ。In the old days, people would apply a mustard plaster to the chest when they caught a cold.
