Definition of "reft"

If thou mayest finde any shore, Or hole , or reft , what ever it were(please add an English translation of this quotation)

c. 1360s (date written)​, Geffray Chaucer [i.e., Geoffrey Chaucer], “The Romaunt of the Rose”, in [William Thynne], editor, The Workes of Geffray Chaucer Newlye Printed, […], [London: […] Richard Grafton for] Iohn Reynes […], published 1542

At one time the summit was beautifully bathed in golden light, whilst the middle part was quite blue, and the snow of its peculiar blue-green colour in the refts. Some of the glaciers are very distinct to us, and with the telescope I can see the refts and corrugations of the different parts, and the edges from which avalanches have fallen […]

1870, Dr. Bence Jones, chapter II, in The Life and Letters of Faraday‎, volume II, Philadelphia: J.B. Lippincott & Co., page 146

Now and again through a reft in the smoke a gleam of sunshine could be seen striking the rocks on the great peak to the west, but it had little or no effect in the gorge.

1894, Ivan Dexter, Talmud: A Strange Narrative of Central Australia, published in serial form in Port Adelaide News and Lefevre's Peninsula Advertiser (SA), Chapter VII