ה֣וֹן עָ֭שִׁיר קִרְיַ֣ת עֻזּ֑וֹ וּכְחוֹמָ֥ה נִ֝שְׂגָּבָ֗ה בְּמַשְׂכִּיתֽוֹ׃
La fortune est une place forte pour le riche, un rempart tutélaire, à ce qu’il s’imagine.
Rashi on Proverbs
and like a strong wall his wealth is to him in his chambers. Since the house is paved with a floor of stones that cover the earth, it is called אבן משכית, a covering stone.