Learner's definition of DANGER
1 a [noncount] : the possibility that you will be hurt or killed
b : the possibility that something unpleasant or bad will happen
I was unaware of the danger that lay ahead.
She was fearless in the face of danger.
None of us had any real sense of danger. [=we did not think that we might be hurt or killed]
It was a journey fraught with danger. [=a very dangerous journey]
Patients need to be informed about the danger posed by the drug. [=about the ways the drug could possibly hurt them]
The sign on the door read “Danger. Keep out.”
Their lives are in (grave/great/serious) danger.
We're not out of danger yet. [=there is still a chance that we could be hurt or killed]
There's less danger that you'll lose your money if you have a wide variety of investments.
We're all in danger of losing our jobs. [=we may all lose our jobs]
These animals are in danger of becoming extinct. = They are in danger of extinction.
(humorous) Don't worry about being ready for us by noon. There's no danger [=no chance] that we'll actually be there on time.
◊ A danger zone is a place or situation in which you may be hurt or killed or in which something unpleasant or bad may happen.
2 [count] : a person or thing that is likely to cause injury, pain, harm, or loss
It's important to teach your children about the dangers of smoking.
Here is a list of possible dangers associated with the procedure.
We believe it poses a serious danger to our national security.
He is a danger to himself and others. [=he might hurt himself and other people]