A more thorough explanation:

Definition: Trusteeship refers to the office, status, or function of a trustee. In international law, it refers to the administration or supervision of a territory by one or more countries, especially under a U.N. trusteeship council.

Examples:

• A trustee is a person who is appointed to manage property or assets on behalf of someone else. For example, a parent may appoint a trustee to manage a trust fund for their child until they reach a certain age.
• After World War II, several territories were placed under trusteeship by the United Nations, including the Pacific Islands and parts of Africa. The purpose of the trusteeship was to prepare these territories for self-government.

The examples illustrate how trusteeship can refer to both the role of a trustee in managing assets and the international administration of territories. In both cases, trusteeship involves a responsibility to act in the best interests of others and to ensure that resources are managed effectively and fairly.