noun
loud criticism; torrent of criticism; fierce denouncement
A yojijukugo describing a situation where many people are loudly criticizing or denouncing something, often in public. Used in news or formal contexts.
その政治家の発言は非難轟々だった。
The politician's remarks drew a torrent of criticism.
新制度に対して非難轟々の声が上がった。
There was an uproarious outcry against the new system.
非難 is the general word for 'criticism' or 'blame'; 非難轟々 specifically emphasizes the loud, widespread, and intense nature of the criticism.
A yojijukugo combining 非難 (criticism) with 轟々 (roaring, booming), literally 'criticism roaring'. The second part is an onomatopoeic reduplication.