(~s)
1.
If you say that someone has a ~ about something, you mean that they seem to be unable to understand it or to see how important it is.
The prime minister has a ~ on ethical issues...
When I was single I never worried about money–it was a bit of a ~.
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2.
A ~ is an area in your range of vision that you cannot see properly but which you really should be able to see. For example, when you are driving a car, the area just behind your shoulders is often a ~.
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