in trust—(of money) held or invested for a person by another individual or an organization:
- His mother’s money was left in trust for him to acquire at the age of twenty-five.
on trust—
1. (of declarations, etc.) accept without asking for proof:
- Official statements are no longer taken on trust. The phenomenon is called the “credibility gap.”
2. on credit:
- The man who purchases on trust not only pays for the trust, but he also pays his due share of what the tradesman loses by trust.