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罪魁祸首

zuì kuí huò shǒu

the chief culprit; the root cause

Character by character

罪zuì
crime
魁kuí
chief
祸huò
disaster
首shǒu
head

Example

专家认为,长时间近距离看屏幕是孩子近视的罪魁祸首之一。
Experts believe long hours looking at screens up close are one of the main culprits behind children’s short sight.

Tone: negative (criticism).

Usage and origin

Once the ringleader of a crime; now just as often a thing: 堵车的罪魁祸首, 污染的罪魁祸首. Often softened with 之一.

Learn this in Lesson 118 · HSK 7–9: 土坑酸菜 (Exposé: the pickled-cabbage pits)
A dialogue, a reading, word cards with audio and a drill that uses it, in Learn Chinese with Bao. The first lessons of every level are free.
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