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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.

Jonathan Romain, the former rabbi of Maidenhead synagogue in Berkshire, now regularly spends his Shabbat mornings standing outside it on guard duty.

From BBC • May 2, 2026

Still, banks also flagged plenty of reasons to be on guard.

From The Wall Street Journal • Apr. 15, 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

While Reyes' decision means that TPS holders can't be legally deported right now, many in the community remain on guard.

From Barron's • Mar. 12, 2026

Reluctant to wake him, I returned to the steps to stay on guard.

From "Crispin: The Cross of Lead" by Avi

on guard

Example Sentences

Related Words