異口同音(いくどうおん)

いくどうおん
noun
in unison, with one voice
1. in unison, with one voice, unanimously
Everyone saying the same thing, expressing the same opinion.
全員(ぜんいん)が異口同音(いくどうおん)に賛成(さんせい)した。
Everyone agreed in unison.
異口同音(いくどうおん)に「素晴(すば)らしい」と言(い)った。
They all said "wonderful" with one voice.
参加者(さんかしゃ)たちは異口同音(いくどうおん)に不満(ふまん)を述(の)べた。
The participants unanimously expressed their dissatisfaction.

A 四字熟語(よじじゅくご) (four-character idiom) meaning 'with one voice' or 'unanimously.'

ETYMOLOGY:
異口(いく) (different mouths) + 同音(どうおん) (same sound) — many people with different mouths all saying the same thing.

COMMON PATTERNS:

  • 異口同音(いくどうおん)に: unanimously, with one voice (adverbial use)
  • 異口同音(いくどうおん)に言(い)う: to say with one voice
  • 異口同音(いくどうおん)に賛成(さんせい)する: to unanimously agree

USAGE:
Somewhat literary/formal. Used in writing and formal speech more than casual conversation. Emphasizes that multiple people independently expressed the same opinion or reaction.

SIMILAR EXPRESSIONS:

general
Added 2026.1.16 17:36 · Revised 2026.6.8 3:09
05500/05666_ikudouon