茅塞頓開

máosèdùnkāi

to all of a sudden see the light; to suddenly become enlightened

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mao2 se4 dun4 kai1

murky darkness suddenly opens (idiom); a sudden flash of insight and all is clear

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茅塞頓開|茅塞顿开 [máo sè dùn kāi] ► murky darkness suddenly opens (idiom); a sudden flash of insight and all is clear