1. people who are responsible for taking care of or protecting something
2. people employed to clean and maintain a building

Examples

• The museum custodians carefully preserve ancient artifacts.
• Parents are the custodians of their children’s well-being.
• The school custodians work hard to keep the hallways clean.
• Environmental groups serve as custodians of our natural resources.
• The night custodians locked up the office building.
• Library custodians protect rare books and manuscripts.
• The custodians of the trust fund managed the investments wisely.