Blackmail
The word blackmail is variously derived from the word for tribute (in modern terms, protection racket) paid by English and Scottish border dwellers to Border Reivers in return for immunity from raids and other harassment. The "mail" part of blackmail derives from Middle English male, "rent, tribute".[11] This tribute was paid in goods or labour (reditus nigri, or "blackmail"); the opposite is blanche firmes or reditus albi, or "white rent" (denoting payment by silver). An alternative version is that rents in the Scottish Borders were often paid in produce of the land, called "greenmail"[citation ^needed] ('green rent'), suggesting "blackmail" as a counterpart paid perforce to the reivers. Alternatively, Mackay[obsolete ^source] derives it from two Scottish Gaelic words blathaich pronounced (the th silent) bla-ich (to protect) and mal (tribute, payment), cf. buttock mail. He notes that the practice was common in the Scottish Highlands as well as the Borders.[12] In the Irish language, the term cíos dubh, meaning "black rent", was used for similar exactions.