be on guard

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

On top of that, we now have to be on guard at one of the most vulnerable moments of our careers.

From The Wall Street Journal • Apr. 16, 2026

An extreme heat warning remains in place for most inland areas — and a heat advisory for coastal regions — through Friday, with officials urging people to be on guard for signs of heat-related illness.

From Los Angeles Times • Mar. 19, 2026

Flynn warned that it’s safer “to be on guard for any outcome over the weekend” — although risk could go either way.

From MarketWatch • Feb. 6, 2026

The sense of fear is palpable in parts of northern Japan, where some locals have fastened bells to their bags hoping the noise will keep bears away, while signs warn people to be on guard.

From Barron's • Nov. 8, 2025

The prince should be on guard against them and fear them as if they were declared enemies, because they will always help to bring about his downfall in adverse times.

From "The Prince" by Niccolò Machiavelli