set up a trust fund
A "trust fund" is a kind of financial account that you can create. It keeps money safe for someone and pays money out to them according to certain rules. A lot of wealthy parents create trust funds for their children, so that the children will have money but won't be able to spend it all immediately.
To describe someone creating a trust fund, use the phrasal verb "set up":
My folks set up a trust fund for me back in the 1980's.
You can also use "set up" for:
- starting a company
- organizing a meeting
- making an appointment