The young clergyman, after a few hours of privacy, was sensible that the disorder of his nerves had hurried him into an unseemly outbreak of temper, which there had been nothing in the physician’s words to excuse or palliate.
There are no more uses of "palliate" in the book.
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We can palliate, but not cure the disease.
Congress is better at palliating the suffering of the unemployed than at creating an environment conducive to job creation.