הַרְחִ֣יבִי ׀ מְק֣וֹם אָהֳלֵ֗ךְ וִירִיע֧וֹת מִשְׁכְּנוֹתַ֛יִךְ יַטּ֖וּ אַל־תַּחְשֹׂ֑כִי הַאֲרִ֙יכִי֙ מֵֽיתָרַ֔יִךְ וִיתֵדֹתַ֖יִךְ חַזֵּֽקִי׃
要擴張你帳幕的地方，讓人把你居所的幔子遠遠張開，不要捨不得；要放長你的繩索，堅固你的橛子。
Ibn Ezra
Enlarge the place of thy tent, because of the larger number of thy children.
Rashi
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.