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
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Recent Examples of red alert
In one of the latest instances of extreme weather, at least 30 people died this week on the outskirts of Beijing after the city issued the highest-level red alert for heavy rain, according to state media.
—
Evelyn Cheng, CNBC, 31 July 2025
Aviation officials issued a red alert for passing aircraft due to the height of the ash plume, which reached several kilometers into the atmosphere.
—Gabe Whisnant, MSNBC Newsweek, 30 July 2025
Over the weekend, Kerr County issued a code red alert because of an excessive rainfall forecast.
—Marlene Lenthang, NBC news, 14 July 2025
Italy, meanwhile, issued heat wave red alerts across 17 cities, including Milan and Rome.
—Karissa Waddick, USA Today, 2 July 2025
See All Example Sentences for red alert
Evelyn Cheng, CNBC, 31 July 2025
Aviation officials issued a red alert for passing aircraft due to the height of the ash plume, which reached several kilometers into the atmosphere.
—Gabe Whisnant, MSNBC Newsweek, 30 July 2025
Over the weekend, Kerr County issued a code red alert because of an excessive rainfall forecast.
—Marlene Lenthang, NBC news, 14 July 2025
Italy, meanwhile, issued heat wave red alerts across 17 cities, including Milan and Rome.
—Karissa Waddick, USA Today, 2 July 2025
See All Example Sentences for red alert
Recent Examples of Synonyms for red alert
Noun
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This watch guide was created using technology provided by Data Skrive.—
Data Skrive,
New York Times,
28 Sep. 2025
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The heaviest rainfall and wind impacts were forecast for coastal communities within the watch area.—
Hollie Silverman,
MSNBC Newsweek,
28 Sep. 2025
Noun
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This patience is watchfulness, not idleness.—
Francois Botha,
Forbes.com,
7 Sep. 2025
Noun
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The website will also give you alerts as to when a particular piece is low in stock, which is always useful!—
Sarah Lyon,
Southern Living,
27 Sep. 2025
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Staying safe means staying alert at all times.—
Kurt Knutsson,
FOXNews.com,
27 Sep. 2025
Noun
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Pre- and post-mission evaluations will be compared to in-flight data to better understand how the deep space mission influences the crew's alertness, stress and ability to work together cohesively.—
Josh Dinner,
Space.com,
17 Sep. 2025
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Morning sunlight signals the brain to wake fully, thus elevating alertness and setting the body’s internal clock.—
Julian Hayes II,
Forbes.com,
14 Sep. 2025
Noun
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Today, her clients learn not only to calm their stress but to channel their nervous system’s vigilance into authenticity, resilience, and trust.—
Malana VanTyler,
USA Today,
25 Sep. 2025
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Karen emphasizes the need for vigilance.—
Lauryn Higgins,
Flow Space,
24 Sep. 2025
Cite this Entry
“Red alert.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/red%20alert. Accessed 30 Sep. 2025.
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