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Or: "allowed me to fall into error". The term aghwahu denotes both "he caused [or "allowed"] him to err" or "he caused him to be disappointed" or "to fail in attaining his desire" (cf. Lane VI, 2304f.). Since, in this case, the saying of Iblis refers to the loss of his erstwhile position among the angels, the rendering adopted by me seems to be the most appropriate.
Another instance of Iblis's subtlety and falsehood. He waits till he gets the respite. Then he breaks out into a lie and impertinent defiance. The lie is in suggesting that Allah had thrown him out of the Way, in other words misled him: whereas his own conduct was responsible for his degradation. The defiance is in his setting snares on the Straight Way to which Allah directs men.