Longman Dictionary of Contemporary English homepage

warning

2 adjective
     
warning2 [only before noun]
1 a warning action or thing tells you that something bad or dangerous might happen:
He had intended only to fire a warning shot.
Do not ignore warning signs such as tiredness.
The brake warning light came on.
a warning look/glance
Owen gave him a warning glance.
2

warning bell/bells

used to say that something makes someone start to be worried or careful about something
a warning bell rings/sounds
As she read his letter, warning bells began to sound in her head.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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