The term 'CRUCIAL TIME' can be broken down into three crossword solutions: CRISIS (6 letters), DDAY (4 letters), and ZEROHOUR (8 letters). The term 'CRISIS' is used to describe a situation in which a difficult or important decision must be made. 'DDAY' is a term used to refer to June 6th, 1944, when Allied forces invaded Normandy during World War II. 'ZEROHOUR' is a term used to refer to the time of day when a major event or operation is scheduled to begin. All three terms are used to describe a time of great importance or urgency.