tantamountyoudaoicibaDictYouDict[tantamount 词源字典]
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 etymology, tantamount origin, 英语词源]
tantamount (adj.)youdaoicibaDictYouDict
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.)).