It was a euphemism for ignorance, or lack of sufficient observation.
It was a euphemism for something.
The phrase has become a euphemism for the erosion of workers' basic rights.
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An elegant euphemism characteristically French.
A euphemism is with him a falsehood.
In like manner, Sleep came to be used as a euphemism for Death.
It was a euphemism for death among the old comrades.