Clinch v. t. [imp. & p. p. Clinched p. pr. & vb. n. Clinching.]
 1. To hold firmly; to hold fast by grasping or embracing tightly. “Clinch the pointed spear.”
 2. To set closely together; to close tightly; as, to clinch the teeth or the first.
 3. To bend or turn over the point of (something that has been driven through an object), so that it will hold fast; as, to clinch a nail.
 4. To make conclusive; to confirm; to establish; as, to clinch an argument.