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warning sign

NOUN
sign of things to come
Synonyms
WEAK
danger sign foreshadowing handwriting on the wall harbinger portent prediction preindication premonition sign signal warning

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.

Just a few years ago, an increase of that size would have been viewed as a warning sign for the economy.

From MarketWatch • May 7, 2026

Going to bed at different times each night during midlife could be a warning sign for future heart problems.

From Science Daily • May 5, 2026

Dr Aziza sorts fact from fiction, explains when a daytime snooze could be a warning sign, and whether an espresso really helps you nail the perfect power nap.

From BBC • May 4, 2026

South Hadley is a warning sign for financially strained municipalities across the U.S.

From The Wall Street Journal • Apr. 16, 2026

Looking back, Will thought that should have been a warning sign.

From "Nine, Ten: A September 11 Story" by Nora Raleigh Baskin