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Jyutping maan6 ok3 zi1 jyun4
Pinyin wàn è zhī yuán

Definitions (CC-CEDICT)
  1. the root of all evil
Definitions (Wiktionary)
  1. noun
    root of all evil; source of all evil
  2. noun, Internet
    source of a meme; the original image, video, etc., that sparked an Internet phenomenon
Examples (Wiktionary)
  1. Mandarin
    过早优化是万恶之源
    過早優化是萬惡之源
    guò zǎo yōu huà shì wà nè zhī yuán
    • premature optimization is the root of all evil