The term COMPLETELY LOSE IT can be broken down into four crossword solutions: SNAP (4 letters), ERUPT (5 letters), GOAPE (5 letters), and FALLAPART (9 letters). SNAP is an informal verb meaning to break suddenly and noisily, usually referring to the sound of something breaking. ERUPT is a verb meaning to burst out suddenly and violently, often referring to a volcano or other natural phenomenon. GOAPE is an informal verb meaning to behave in a wild and uncontrolled way, often used to describe someone who is angry or upset. Finally, FALLAPART is a verb meaning to break down into pieces, often referring to something that has been damaged or worn out. Together, these words describe the phrase COMPLETELY LOSE IT, which is an idiom meaning to become very emotional or lose control of one's emotions.