הַרְחִ֣יבִי ׀ מְק֣וֹם אָהֳלֵ֗ךְ וִירִיע֧וֹת מִשְׁכְּנוֹתַ֛יִךְ יַטּ֖וּ אַל־תַּחְשֹׂ֑כִי הַאֲרִ֙יכִי֙ מֵֽיתָרַ֔יִךְ וִיתֵדֹתַ֖יִךְ חַזֵּֽקִי׃
Erweitere den Raum deines Zeltes, und die Umhänge deiner Wohnung werden auseinandergespannt; spare nicht, ziehe lang deine Seile und befestige deine Pflöcke.
Ibn Ezra on Isaiah
Enlarge the place of thy tent, because of the larger number of thy children.
Rashi on Isaiah
lengthen your cords These are thin ropes that hang at the bottom of tents, and that are tied to stakes called ‘chevills’ in French, which are thrust into the ground.