The term 'REALLY DIG' can be broken down into four crossword solutions: PROBE, ADORE, EATUP, and LAPUP. PROBE means to investigate or examine something thoroughly, while ADORE means to love deeply and passionately. EATUP means to consume or devour something, and LAPUP means to take in eagerly or accept something readily. Together, these four words describe the phrase 'REALLY DIG' which is an informal way of saying that someone is very enthusiastic about something.