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be on alert

VERB
watch
Synonyms
STRONGEST
attend guard protect take care of wait
STRONG
mind oversee patrol police superintend tend watch over
WEAK
be on the lookout be vigilant be wary be watchful care for keep an eye on keep eyes open keep eyes peeled keep watch over look after look out pick up on ride shotgun for take heed
Antonyms
STRONGEST
ignore neglect
WEAK
harm hurt overlook pass by

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.

The IMF chief said regulators should be on alert for any signs of instability in the financial system as a consequence of the conflict.

From The Wall Street Journal • Apr. 9, 2026

Anyone playing in the already-volatile small-cap arena should be on alert to avoid getting burned.

From Barron's • Nov. 18, 2025

Dog owners may need to be on alert for a disease many have never heard of — anaplasmosis, spread by the same tick that transmits Lyme disease.

From Los Angeles Times • Aug. 18, 2025

Fire services will be on alert for more wildfires after analysis showed the area burned in the UK in 2025 is already higher than for any year in more than a decade.

From BBC • Apr. 28, 2025

Lately, I felt like I always had to be on alert for the next raccoon invasion.

From "Crenshaw" by Katherine Applegate