Equivalent in seriousness to; virtually the same as.
Mid 17th century: from the earlier verb tantamount ‘amount to as much’, from Italian tanto montare.
“His reaction is tantamount to guilt, he may as well have confessed.”
Machree (noun) (Irish/Scots)
As a form of address: my dear. Now chiefly in “Mother Machree”, expressing (usually ironically) a stereotyped conception of Celtic or Irish identity.
Late 17th century; earliest use found in Irish Hudibras. From Irish mo chroí (Scottish Gaelic mo chridhe) my heart, my beloved from mo my + croí (Scottish Gaelic cridhe) heart from Early Irish cride heart, cognate with heart [interjection, adverb].