The term 'CATCH, AS CALVES' can be solved by the word 'ROPE', which is a four-letter word. ROPE is a type of cord or string made from natural fibers such as hemp, jute, sisal, or cotton, or from synthetic materials such as nylon or polypropylene. It is often used for tying, binding, or fastening objects together, and has been used since prehistoric times. The phrase 'catch, as calves' refers to the practice of using ROPE to catch and restrain calves, which is still done in some parts of the world today.