The term 'trust-fund' is a modern English compound noun, directly combining two established financial and legal concepts. The first element, 'trust', originates from Old Norse traust, meaning "confidence" or "support," which evolved in English law to signify a fiduciary relationship where assets are managed for a beneficiary. The second element, 'fund', derives from Latin fundus, meaning "bottom" or "estate," which came to represent a permanent stock of capital. When combined, the term literally denotes a "fund held in trust," creating a specific legal and financial concept for assets managed under a trust agreement for future benefit.

Structure: trust (confidence, legal arrangement) + fund (sum of money) - trust: From Middle English trust, from Old Norse traust ("help, confidence, firmness"). In this compound, it denotes a legal arrangement where property is held by one party for another's benefit. - fund: From Latin fundus ("bottom, piece of land, farm"), via French fond. In this compound, it denotes a stock of money or capital set aside for a purpose.