as in watch
the state of being constantly attentive and responsive to signs of opportunity, activity, or danger
the paparazzi were on red alert for sightings of the hot new Hollywood couple
Synonyms & Similar Words
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Antonyms & Near Antonyms
Example Sentences
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Recent Examples of red alert
Punishing temperatures extended to the United Kingdom and Spain, where weather agencies issued red alerts — like France — about the risks of extreme heat for tens of millions of people.
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ABC News,
25 June 2026
In Europe, a record-breaking heatwave has prompted red alerts across the continent.
—
Lim Hui Jie,leonie Kidd,
CNBC,
25 June 2026
Red heat wave alerts across Italy Italy on Monday issued heat wave red alerts for 12 cities.
—
Makini Brice,
USA Today,
23 June 2026
The red alert is the highest level of the national heatwave plan, reserved for an exceptional heatwave.
—
Laure Guilbault,
Vogue,
23 June 2026
See All Example Sentences for red alert
ABC News,
25 June 2026
In Europe, a record-breaking heatwave has prompted red alerts across the continent.
—
Lim Hui Jie,leonie Kidd,
CNBC,
25 June 2026
Red heat wave alerts across Italy Italy on Monday issued heat wave red alerts for 12 cities.
—
Makini Brice,
USA Today,
23 June 2026
The red alert is the highest level of the national heatwave plan, reserved for an exceptional heatwave.
—
Laure Guilbault,
Vogue,
23 June 2026
See All Example Sentences for red alert
Recent Examples of Synonyms for red alert
Noun
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Epstein said the stunt doubles as a virtual watch party for fans who couldn't make it to New York.
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The consumer version compresses that same idea into a ring, watch or app.
Noun
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But the book’s ruminative watchfulness is unsuccessfully conjugated in this overly sedate play with music, which has the feel of a song cycle, though sung by the fine cast with gorgeous, lonely sorrow.
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Hong Kong icon Tony Leung has channeled brooding urban energy for the masterpieces of Wong Kar-Wai, balancing the debonair ennui of Marcello Mastroianni with the quiet watchfulness of Montgomery Clift.
Noun
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Newer models have advanced driver-assistance features, such as automatic emergency braking, lane keeping assist and blind spot monitoring with rear cross-traffic alerts.
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Jim waits 45 minutes after sending a trade alert before buying or selling a stock in his charitable trust’s portfolio.
Noun
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In some cases, people who were previously deficient in certain B vitamins may notice a sudden increase in energy or alertness once supplementation begins.
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The screens influenced more than her alertness.
Noun
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In summary, when facing the threat of lightning, preparedness and vigilance are your best allies.
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Research on stress and cognitive load has shown that ambiguity activates many of the same neural pathways involved in threat detection and vigilance.
Cite this Entry
“Red alert.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/red%20alert. Accessed 5 Jul. 2026.
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