The crossword solution for the term 'FLAKE AT THE LAST MINUTE' is BAIL, which is a four-letter word. BAIL is a verb meaning to leave or abandon something suddenly, especially when it is difficult or dangerous. It is often used in the phrase 'BAIL out, ' which means to leave a situation quickly and unexpectedly. In this context, FLAKE AT THE LAST MINUTE could mean to abandon a commitment or responsibility at the last minute.