(~s)
Frequency: The word is one of the 3000 most common words in English.
1.
A ~ is something which is said or written to tell people of a possible danger, problem, or other unpleasant thing that might happen.
The minister gave a ~ that if war broke out, it would be catastrophic...
The government has unveiled new health ~s for cigarette packets.
N-COUNT: oft N that, N to-inf
2.
A ~ is an advance notice of something that will happen, often something unpleasant or dangerous.
The soldiers opened fire without ~...
With no ~, he was fired from his job...
N-VAR: oft without N
3.
Warning actions or signs give a ~.
She ignored the ~ signals...
Some fog ~ signs had been put up with flashing yellow lights.
ADJ: ADJ n