The term 'END OF A COUNTDOWN' can be broken down into three crossword solutions: ONE (3 letters), TWOONE (6 letters), and BLASTOFF (8 letters). The first solution, ONE, is a single word that means 'an individual unit'. The second solution, TWOONE, is a combination of two words that mean 'a number greater than ONE'. The third solution, BLASTOFF, is a single word that refers to the launch of a rocket. Together, these three solutions form the phrase 'END OF A COUNTDOWN', which is used to describe the moment when a countdown reaches zero and an event begins.