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wa 'ivaa aljibaalu suyyirat {3}

[Shakir 81:3] And when the mountains are made to pass away,
[Pickthal 81:3] And when the hills are moved,
[Yusufali 81:3] When the mountains vanish (like a mirage);

suyyirat: made to move casually. Not rough kind of movement. It just floating away.
sayyaarao; doesnt mean like caravan nowadays. In old times were camels and horses. They travelled softly.
saara; casually take a walk like walking in the garden.