Thesaurus.com
Dictionary.com
Showing results for warning signal.

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.

Notably, a doji candle in September provided an early warning signal that upside momentum was faltering.

From Barron's • Jan. 5, 2026

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

From MarketWatch • Dec. 21, 2025

"Queen pupae, which have stronger immune defenses than worker pupae and can limit the infection on their own, were not observed to emit this warning signal to the colony," she explains.

From Science Daily • Dec. 3, 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

He broke off as Pima flashed a warning signal.

From "Ship Breaker" by Paolo Bacigalupi

Vocabulary.com logo
by dictionary.com

Look it up. Learn it forever.

Remember "warning signal" for good with VocabTrainer. Expand your vocabulary effortlessly with personalized learning tools that adapt to your goals.

Take me to Vocabulary.com