To be stunned or speechless with shock or surprise.
形容因吃惊或害怕而发愣的样子。
元·无名氏《赚蒯通》第一折吓得项王目瞪口呆，动弹不得。”
When he saw the magician pull a rabbit out of the hat, he was completely dumbfounded.
Learn the next connected idiom: 目瞪口呆 (mù dèng kǒu dāi) → 呆若木鸡 (dāi ruò mù jī)
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