The term USE A SEMAPHORE can be broken down into two parts: the word 'USE' and the phrase 'a semaphore'. The word 'USE' is a verb meaning to employ or put into service. The phrase 'a semaphore' refers to a system of visual communication using flags, lights, or other indicators. The crossword solution for this term is SIGNAL, which is a noun meaning a gesture, action, or sound that conveys information. Therefore, the term USE A SEMAPHORE can be summarized as employing a system of visual communication using flags, lights, or other indicators to convey information.