The term 'PRACTICE IN A RING' can be summarized by the four-letter word 'SPAR'. Sparring is a form of training in martial arts, boxing, and other combat sports. It involves two participants engaging in simulated combat, usually with protective gear, in order to practice techniques and strategies without causing serious injury. Sparring typically takes place in a ring, which is why the term 'PRACTICE IN A RING' can be summarized by the word 'SPAR'.