The term 'BIG BLAST' can be broken down into three separate crossword solutions: KABOOM (6 letters), DIN (3 letters), and NTEST (5 letters). KABOOM is an onomatopoeia that is used to describe a loud explosion or burst of sound. DIN is a loud, continuous noise, usually associated with a large crowd or machinery. NTEST is an acronym for Non-Technical Exploratory System Test, which is a type of software testing that focuses on the user experience. Together, these three words form the phrase 'BIG BLAST, ' which is often used to describe a powerful explosion or event.