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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.

Historically, the absence of a year-end rally has carried a warning signal.

From MarketWatch • Dec. 21, 2025

“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

Liverpool's relative stroll towards a 20th title carries a heavy warning signal to the rivals who must now attempt to knock the Premier League crown off their heads next season.

From BBC • Apr. 28, 2025

"This innovative pressure release valve opens automatically when critical pressure is reached, emitting a clearly audible warning signal," explains Dr Falk Tauber, co-author and project manager.

From Science Daily • Nov. 20, 2024

She tried to smile, but it felt more like she was baring her teeth at her friend, a warning signal to stay away.

From "Far from the Tree" by Robin Benway