This whale is not dead; he is only dispirited; out of sorts, perhaps; hypochondriac; and so supine, that the hinges of his jaw have relaxed, leaving him there in that ungainly sort of plight, a reproach to all his tribe, who must, no doubt, imprecate lock-jaws upon him.
There are no more uses of "reproach" in the book.
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She reproached him for being thoughtless and lazy.
Don’t reproach yourself for things beyond your control.