The term 'CROSSED THE CHANNEL' can be solved by the four-letter word 'SWAM'. This term is used to describe the act of swimming across the English Channel, a body of water that separates England and France. The English Channel is one of the busiest shipping lanes in the world and is known for its strong currents and unpredictable weather. Swimming across the channel is considered a great feat of endurance and has been accomplished by many people over the years.