To speak with one voice; all saying the same thing.
不同的嘴说出相同的话。指大家说得都一样。
《宋书·庾炳之传》伏复深思，只有愚滞，今之事迹，异口同音，便是彰著，政未测得物之数耳。”
When asked about the incident, the witnesses answered in unison.
Learn the next connected idiom: 异口同声 (yì kǒu tóng shēng) → 声势浩大 (shēng shì hào dà)
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