1 To make a permanent join. Thus a clenched shackle, with which, for example, the end of a chain cable is secured to the bottom of the chain locker, has its bolt hammered over so that it cannot be removed, thus closing the shackle permanently.
2 To rivet with copper nails and roves (conical copper washers). A more simple method is to turn over the point of the nail without using roves. See also clinching.