1. 谴责;痛斥
Denunciation of someone or something is severe public criticism of them.
e.g. On September 24, he wrote a stinging denunciation of his critics...
9月24号，他写了一篇痛斥那些批评者的措词强烈的文章。
e.g. He has been scathing in his denunciation of corrupt and incompetent politicians.
他抨击起那些腐败无能的政客来一直都很尖刻犀利。
2. 告发;检举
Denunciation is the act of reporting someone who has broken a rule or law to the authorities.
e.g. ...the denunciation of Jews to the Nazis during the Second World War.
第二次世界大战期间向纳粹分子告发犹太人