I considered that the strong wish you expressed to go there, when an adequate sum was furnished, was tantamount to an engagement that you would remain there for life.
Will was in a defiant mood, his consciousness being deeply stung with the thought that the people who looked at him probably knew a fact tantamount to an accusation against him as a fellow with low designs which were to be frustrated by a disposal of property.
There are no more uses of "tantamount" in the book.
Show samples from other sources
Her statement was tantamount to an admission of guilt.
Not telling her is tantamount to aiding and abetting the enemy.