It was a euphemism for ignorance, or lack of sufficient observation.
What is the euphemism for people who do the work properly for which they are paid?
Bonus points will be awarded for the most ridiculous euphemism.
It was a euphemism for death among the old comrades.
That exclamation of surprise is one of the few euphemisms that avoid the use of the word God.
It appears that we have a new euphemism, "feeling a bit tired".
The phrase has become a euphemism for the erosion of workers' basic rights.
In like manner, Sleep came to be used as a euphemism for Death.