| Cave-In | A cave-in is the sudden movement of soil or rock into an excavation or trench. | Construction Administration |
| Protective System | A protective system is a method used to protect workers from excavation cave-ins and related hazards. | Construction Administration |
| Trench | A trench is a narrow excavation commonly used for utilities, foundations, or drainage work. | Construction Administration |
| Trench Box | A trench box is a protective shield used inside a trench to help protect workers from cave-ins. | Construction Administration |