A euphemism is an expression in which you avoid saying something unpleasant and reword it to make pleasant.
Examples:
Terminological inexactitude=lie
Shortening the front line=retreating from the battlefield
To be deprived of ones side=to be blind
Someone who is an under-achiever=an idler or stupid person
The under developed countries=poor countries
The underprivileged=the poor
To translate the truth=to lie
Someone whose actions are incompatible with their diplomatic duties=a spy
Someone who is eating for two=a pregnant woman
Under extreme physical duress=under torture
Someone who is undergoing corrective training=a political prisoner
To depart from this life=to die,pass away