B1
something that tells or shows you that something bad may happen
Dictionary examples:
My doctor's warning: 'Stop googling your symptoms and call me instead.' (0.0)
The beach warning: 'Swim at your own risk. Sharks can't read this sign.' (0.0)
The gym's warning: 'No selfies in the mirror. We can see you.' (0.0)
Just a word of warning - restaurants in this area can be very expensive. (23.2)
A bad storm can strike without warning. (26.1)
There's a health warning on every pack of cigarettes. (39.3)
The Food and Drug Administration issued a warning to doctors about the dangers of the drug. (54.7)