adj. 25B6; adjective this is tantamount to mutiny : EQUIVALENT TO, equal to, as good as, more or less, much the same as, comparable to, on a par with, commensurate with.
TANTAMOUNT
Meaning of TANTAMOUNT in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012