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be alert

VERB
look out
Synonyms
WEAK
be careful be on guard beware check out have a care heads up hearken keep an eye out keep tabs listen mind notice pay attention peg pick up on scope shotgun size up spot spy watch out
Antonyms
WEAK
disregard ignore neglect

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.

But policymakers will be alert to signs that the energy shock is spilling over.

From The Wall Street Journal • Apr. 24, 2026

The Met had earlier promised an increased police presence in response to the protest, adding officers would be "alert to any behaviour that crosses the line from protest into criminality".

From BBC • Mar. 28, 2026

“We have to be alert to second round effects but there are risks on both sides.”

From The Wall Street Journal • Mar. 26, 2026

Nvidia earnings ought to quell any major AI fears for now, but investors need to be alert for signs of who will be the winners and the losers.

From Barron's • Feb. 26, 2026

"Space travel is dangerous. They need to be alert and undistracted. They're sad that they lost a crewmate, but they'd be devastated if they found out they'd abandoned him alive."

From "The Martian" by Andy Weir