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on guard

ADJECTIVE

defensive

Synonyms

WEAK

alert averting cautious checking defending expectant guarding preservative preventive protecting safeguarding vigilant warding off watchful withstanding

ADVERB

feeling wary

Synonyms

WEAK

alert careful cautious defensive guarded heedful mindful observant on one's guard on one's toes on the lookout on the watch vigilant wary watchful

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.

You need to be on guard not only against the craziness of this market, but the possibility that you won’t be able to resist it.

From The Wall Street Journal • Apr. 17, 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. 18, 2026

Traders remain on guard about developments in the tech space as they worry that the hundreds of billions firms have pumped into AI may not see any returns for some time.

From Barron's • Feb. 11, 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

Soldiers who have been stationed nearby on guard duty in the neighborhood come running.

From "Lincoln's Last Days: The Shocking Assassination that Changed America Forever" by Bill O'Reilly

on guard

Example Sentences

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