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warning signal

NOUN
alarum
Synonyms
STRONG
alert bell signal siren warning
WEAK
call to arms
NOUN
beacon
Synonyms
STRONGEST
flare lantern radar
STRONG
alarm alert balefire beam bonfire guidepost heliograph lamp lighthouse lodestar pharos rocket sign watchtower
WEAK
signal fire smoke signal
NOUN
distress signal
Synonyms
WEAK
Mayday SOS alarm burglar alarm call for help danger signal fire alarm flare notice to mariners signal of distress
NOUN
high sign
Synonyms
WEAK
alert signal the nod the wink

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.

So how should investors play the current warning signal?

From MarketWatch • May 7, 2026

The clogged pathways are known as "enlarged perivascular spaces," and the findings suggest they could serve as an early warning signal for Alzheimer's, the most common form of dementia.

From Science Daily • Jan. 3, 2026

“We finally have a tactical euphoria warning signal for the first time in 5 years, and for the first time in 18 years excluding COVID,” wrote credit strategists at Deutsche Bank, led by Steve Caprio.

From Barron's • Oct. 20, 2025

The Department for Health and Social Care said that genomics - the study of genes - and AI would be used to "revolutionise prevention" and provide faster diagnoses and an "early warning signal for disease".

From BBC • Jun. 21, 2025

Obviously the red light was some kind of a warning signal, both outside the door and in—“laboratory animal at large.”

From "Mrs. Frisby and the Rats of NIMH" by Robert C. O'Brien