tantamount
/ˈtæntəmaʊnt/adjective
predic.(tantamount to)
- equivalent in seriousness to; virtually the same as相当于的：
the resignations were tantamount to an admission of guilt.
辞职就相当于承认有罪。
词源
mid 17th cent.: from the earlier verb tantamount 'amount to as much'， from Italian tanto montare.