The crossword solution for the term PASS OR ___ is FAIL, which is a four-letter word. The phrase 'pass or FAIL' is commonly used to describe a situation in which one must succeed or else face a negative consequence. It is often used in educational contexts, such as when a student must pass an exam in order to receive a passing grade. It can also be used in other contexts, such as when someone must pass a job interview in order to be hired. In any case, the phrase implies that there are only two possible outcomes: success or failure.