Few words in the English language carry as grim a literal meaning as 'mortgage.' Composed of two Old French elements — 'mort' (dead) and 'gage' (pledge) — it is, at its most literal, a death pledge. The explanation of why a property loan should be called a dead pledge was offered in memorable terms by the English jurist Sir Edward Coke in his 'Institutes of the Lawes of England' (1628): the pledge is called dead either because when the debtor fails to pay, the land is lost and dead to him, or because when he does pay, the pledge itself is dead and gone.
The first element, 'mort,' descends from Latin 'mortuus,' the past participle of 'mori' (to die). Latin 'mori' traces back to the Proto-Indo-European root *mer-, which carried the sense of dying or being harmed and was remarkably productive across the Indo-European language family. In Latin it gave 'mors' (death), 'mortalis' (subject to death), and 'murdrum' (secret killing, which entered English as 'murder'). In Germanic languages
The second element, 'gage,' is a pledge or security, a word of Germanic origin that entered French through Frankish. It is cognate with Old English 'wed' (pledge, security), which survives in 'wedding' — marriage being historically a pledge or security exchange between families — and in 'wage,' originally a pledge of service. The French form 'gage' also produced English 'engage' (to pledge oneself) and 'gauge' in some analyses, though the latter is contested.
In medieval property law, a 'mortgage' was a specific legal instrument distinct from other forms of pledge. When a borrower mortgaged land to a lender, the lender typically took possession of the land and collected its rents and profits until the debt was repaid. This was the 'living pledge' or 'vif gage': the lender's income from the land counted toward extinguishing the debt, so the pledge was alive, working. In a mortgage, by contrast, the rents went to the lender
The word entered English in the late fourteenth century in its French form, appearing in legal documents and in Chaucer. It has always been a term of art rather than a common word, tied specifically to property law. The mechanics of mortgages have changed enormously — today's amortizing mortgage, in which each payment reduces the principal, is closer in spirit to the medieval 'living pledge' than to the original 'dead pledge' — but the name has never changed.
The word is also notable for its silent letters. The 't' in 'mortgage' is not pronounced in English, a relic of the French origin where the word was already pronounced 'morgaje.' English retained the spelling from Latin roots while adopting the French pronunciation, producing the characteristic gap between spelling and sound that marks so many English words of French origin.