the.com/trust fund

means A legal arrangement where money or assets are held and managed by a trustee for a beneficiary, often paid out on a schedule rather than all at once.

from 'Trust' goes back to Old Norse 'traust' (confidence, firmness), filtered through Middle English into the legal sense of property held by one party for another's benefit — a concept English law formalized for centuries before the phrase 'trust fund' emerged as a plain compound, simply naming the pool of money the trust holds. No hidden backstory here: it's exactly what it sounds like, legal trust plus the fund it protects.