👉 In the context of mechanical engineering, a "countersunk" is an object that protrudes from a flat surface. It can be used to secure or reinforce other parts of a structure by creating a channel between them, allowing for easier movement and positioning. For example, in a pipe system, countersunk can be used to secure the ends of pipes and prevent leakage. In a wheelbarrow, it is used as an attachment point for wheels to grip onto the handlebars.