The term BE VIGILANT can be broken down into three crossword solutions: ALERT (5 letters), OBSERVANT (9 letters), and NAPS (4 letters). Being ALERT means to be watchful and attentive, while being OBSERVANT means to be aware of one's surroundings. NAPS, on the other hand, is a short period of sleep during the day. All three words together suggest that one should stay vigilant and not become complacent in order to remain aware of potential dangers.