One great excellency in this tribe, is their skill at prognostics, wherein they seldom fail; their predictions in real diseases, when they rise to any degree of malignity, generally portending death, which is always in their power, when recovery is not: and therefore, upon any unexpected signs of amendment, after they have pronounced their sentence, rather than be accused as false prophets, they know how to approve their sagacity to the world, by a seasonable dose.
There are no more uses of "portend" in the book.
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I fear the election results portend greater violence in the region.
Few heeded the sign, and not even Bilbo yet had any notion of what it portended.