The crossword solution for the term 'CATCHY THING' is NET, which is a three-letter word. A NET is a device made of fibers, threads, or cords that are woven together to form a mesh or web. Nets are used for catching fish, birds, and other animals, as well as for trapping or blocking movement. They can also be used to catch objects in sports such as volleyball and soccer. In addition, nets are used in computer networks to connect computers and other devices.