It is hardly too much to say that she felt coerced by a force stronger than her own will, not only into the act of promising upon this singularly remote and vague matter, but into the emotion of fancying that she ought to promise.
There are no more uses of "coerce" in the book.
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It is better to convince than to coerce.
The legislative bodies debated about what techniques could be used by the CIA to coerce a suspect into talking.