Which preposition to use with tantamount

to Occurrences 77%

If she were not to meet him, or if she met him, and told him that she could not remain with him, must not speak to him again, it would be tantamount to telling him that she did not believe his father was innocent; and she did believe it.

by Occurrences 1%

For it may be said that though no man in his senses would claim to be incapable of error, yet in every given case he is quite sure that he is not in error, and therefore this assurance in particular is tantamount by process of cumulation to a sense of infallibility in general.

for Occurrences 1%

Tantamount for Equivalent.

tofor Occurrences 1%

[Footnote CD: This expression, both in America and England, is tantamount tofor life.]

Which preposition to use with  tantamount