يلجفclothes (assuming يُلحف was intended) الأرضthe earth كلماwhenever انسابit glides فيهاacross it
يلجف الأرض كلما انساب فيها
حللاrobes منfrom إهابهits hide شملالاswift and nimble
حللا من إهابه شملالا
It clothes the earth whenever it glides across it,
Over the earth he glides, leaving behind
in robes of its own hide, swift and nimble.
Trails of his robe, trailing shawls.
فإذاthen when ماemphatic particle استقامit straightens كانit is قضيباa slender rod
فإذا ما استقام كان قضيبا
وإذاand when ماemphatic particle استدارit curves كانit is هلالاa crescent
وإذا ما استدار كان هلالا
Then, when it straightens, it is a slender rod,
If he moves straight, he is a staff,
and when it curves, it is a crescent.
If he coils, he becomes a crescent moon.