n.a trust that gives the trustee discretion to pay the beneficiary as much of the trust income as the trustee believes appropriate
英汉双解大词典
discretionary trust
1.
N（名词）
a trust in which the beneficiaries' shares are not fixed in the trust deed but are left to the discretion of other persons, often the trustees 自由裁量信托; 指信托文件本身并不确定受益人可得的信托利益，而授权受托人根据实际情况加以分配