異口いく同音どうおん
ikudōon

Noun
no-Adjective

1. (saying) with one voice; unanimously; in chorus; in unison; as one

Yojijukugo
「あいつはいいやつだ」とみな異口いく同音どうおんう。
"aitsuwa ii yatsuda"to minaga ikudōonni iu.
He's a nice guy - that's unanimous.
Other forms: