as in warning
something that tells of approaching danger or risk
the reporter took her glower as a red light and stopped asking questions
Synonyms & Similar Words
Relevance
Antonyms & Near Antonyms
Example Sentences
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Recent Examples of red light
This phenomenon happens because blue light undergoes stronger atmospheric scattering than red light, and as a result, red is the most dominant color as sunlight passes through our atmosphere and casts light on the moon.
—
Ashley Strickland, CNN Money, 31 Dec. 2025
Many of the animals, like the beautiful siphonophore above, come in peachy-pink hues—that’s because red light doesn’t travel far in the dark ocean’s depths, providing the perfect camouflage.
—Andrea Thompson, Scientific American, 25 Dec. 2025
Suarez kept driving, and almost accelerated through a red light.
—Miami Herald, 21 Dec. 2025
The pine trees are beautifully dressed in green, white, and red lights.
—Sugey Palomares, Parents, 20 Dec. 2025
See All Example Sentences for red light
Ashley Strickland, CNN Money, 31 Dec. 2025
Many of the animals, like the beautiful siphonophore above, come in peachy-pink hues—that’s because red light doesn’t travel far in the dark ocean’s depths, providing the perfect camouflage.
—Andrea Thompson, Scientific American, 25 Dec. 2025
Suarez kept driving, and almost accelerated through a red light.
—Miami Herald, 21 Dec. 2025
The pine trees are beautifully dressed in green, white, and red lights.
—Sugey Palomares, Parents, 20 Dec. 2025
See All Example Sentences for red light
Recent Examples of Synonyms for red light
Noun
-
The warning is for Merced - Madera - Mendota, Planada - Le Grand - Snelling, Fresno area, Delano-Wasco-Shafter, Hanford - Corcoran - Lemoore, Visalia - Porterville - Reedley and Southeast San Joaquin Valley.—
CA Weather Bot,
Sacbee.com,
10 Jan. 2026
-
The Times revealed last January that west Altadena never received evacuation warnings, and orders to evacuate came hours after flames and smoke threatened the community.—
Los Angeles Times,
Los Angeles Times,
9 Jan. 2026
Noun
-
Ignoring scale is a common red flag that makes a space look off-balance.—
Shagun Khare,
The Spruce,
9 Jan. 2026
-
If your password manager refuses to fill in a login, that is a red flag worth paying attention to.—
Kurt Knutsson,
FOXNews.com,
8 Jan. 2026
Noun
-
About 30 percent of the galaxies emit radio waves, a sign that their central black holes are active.—
Rupendra Brahambhatt,
Interesting Engineering,
10 Jan. 2026
-
The rich-looking denim alternative was a big trend in 2025, with co-signs from Hailey Bieber and Martha Stewart.—
Kaitlin Clapinski,
InStyle,
10 Jan. 2026
Cite this Entry
“Red light.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/red%20light. Accessed 15 Jan. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
