litotes

understatement for rhetorical effect (especially when expressing an affirmative by negating its contrary); "saying `I was not a little upset when you mean `I was very upset is an example of litotes"

मंत्री ने अपने ही दोष के लिए जिलाधीश पर कटाक्षपूर्ण उक्ति की बौछार की|

the minister showered litotes on the collector for his own faults.