The term 'Thou Shalt Not' is a phrase from the Bible, found in the Ten Commandments. It is used to express a moral imperative, and is often used to refer to the prohibition of certain activities or behaviors. The crossword solutions for this term are KILL (4 letters) and TAB (3 letters). KILL is defined as to cause the death of, while TAB is defined as a small flap or strip attached to an object to facilitate opening or handling. Therefore, the phrase 'Thou Shalt Not' can be interpreted as a warning against causing death or harm, as well as a reminder to handle things with care.