來自短語 tant amount,等同，一致，來自拉丁語 tantus,一樣的，一致，來自 tam,因此，所以， 詞源同 tandem,this,that.主要用於貶義修飾。
英文詞源
tantamount
tantamount: [17] Tantamount means etymologically ‘amounting to as much’. It comes from an earlier verb tantamount ‘amount to as much as, be equal to’, which was a lexicalization of the Anglo-Norman expression tant amunter ‘amount to as much’. This was made up of tant ‘as much’, which came via Old French from Latin tantus, and amunter, ancestor of English amount. => amount, paramount
tantamount (adj.)
1640s, from verbal phrase tant amount "be equivalent" (1620s), from Anglo-French tant amunter "amount to as much" (late 13c.), from Old French tant "as much" (11c., from Latin tantus, from tam "so;" see tandem) + amonter "amount to, go up" (see amount (v.)).
雙語例句
1. What Bracey is saying is tantamount to heresy.
布雷西的言論簡直就是異端邪說。
來自柯林斯例句
2. If he resigned it would be tantamount to admitting that he was guilty.
他若辭職就等於承認自己有錯。
來自《權威詞典》
3. This invasion is tantamount to a declaration of war.
這次侵略就相當於宣戰.
來自《簡明英漢詞典》
4. Her confession was simply tantamount to a casual explanation.
她的自白簡直等於一篇即席說明.
來自《現代英漢綜合大詞典》
5. To neglect or forget aspects of the past is tantamount to rewriting history, and anyone who has read Animal Farm knows where that can lead.