Meaning of “warning” in the English Dictionary

"warning" in English

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warningnoun [ C or U ]

uk /ˈwɔː.nɪŋ/ us /ˈwɔːr.nɪŋ/

B1 something that makes you understand there is a possible danger or problem, especially one in the future:

Completely without warning, he turned up at my door with all four children!
There's a warning on the cigarette packet that says "Cigarettes cause cancer".
I'm not surprised you feel sick after eating so much - let it be a warning to you!
Just a word of warning - restaurants in this area can be very expensive.
formal The Health Minister issued a warning about the dangers of sunbathing.
They can't dismiss you just like that - they have to give you a written warning first.
The police fired warning shots but the rioting continued.
warning sign

a physical condition that shows someone has a disease:

The warning signs of the illness are respiratory problems and dizziness.

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(Definition of “warning” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"warning" in American English

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warningnoun [ C/U ]

us /ˈwɔr·nɪŋ/

notice of a possible danger or problem, so that it can be prevented or avoided:

[ C ] Flood warnings were issued by the National Weather Service.
[ U ] The earthquake struck without warning while the city was asleep.

(Definition of “warning” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"warning" in Business English

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uk /ˈwɔːnɪŋ/ us

[ C or U ] FINANCE a statement or piece of information that tells people that there might be a danger or a problem in the future:

These figures are a warning to the Bank of England not to raise interest rates too quickly.
The telecoms giant issued a warning that profits would be lower than expected.
a warning about/against sth The Fed gave a blunt warning about America's growing deficit.
The chief executive gave warning that losses on credit cards would get worse in the second half of the year.
adequate/advance/early warning
a blunt/clear/stark warning
come/serve as a warning These figures come as a warning that the crisis is not over yet.

[ C ] HR a statement that tells an employee that they have done something wrong:

an oral/verbal/written warning Employees must be given a verbal and a written warning before they can be fired.
a final/formal/official warning

warningadjective [ before noun ]

uk /ˈwɔːnɪŋ/ us

used to show that there might be danger or a problem in the future:

Regulators were accused of ignoring the warning signs that led to the bank's collapse.
warning bells

signs or information telling people that something bad might happen:

The figures should sound warning bells that the economy is still too fragile to enable interest rates to rise.

(Definition of “warning” from the Cambridge Business English Dictionary © Cambridge University Press)