yì异differentkǒu口mouthstóng同sameshēng声voice
With one voice; unanimously.
Literal meaning
different (异) — mouths (口) — same (同) — voice (声)
Origin
A classical four-character phrase describing people speaking in unison.
Examples
Dà大jiā家yì异kǒu口tóng同shēng声de地biǎo表shì示tóng同yì意。
Everyone unanimously expressed their agreement.
Dāng当bèi被wèn问dào到zhè这ge个wèn问tí题shí时，tā他men们yì异kǒu口tóng同shēng声de地huí回dá答shuō说bù不zhī知dào道。
When asked this question, they answered in unison that they didn't know.
Usage & nuances
Often used to emphasize agreement or a shared opinion.
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