Tā yì shēngqì jiù xiàng ge yèchā, shéi dōu bù gǎn rě tā.
When she gets angry she looks like a demon, and nobody dares cross her.
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The word comes from Sanskrit yaksha. In Buddhism some yakshas became guardians of the Dharma, but in everyday speech 夜叉 is an insult for a fierce or ugly person, and 母夜叉 for a shrewish woman.