防患于未然 (fáng huàn yú wèi rán) — to take preventive measures before trouble arises; to nip in the bud

Definition

A formal chengyu meaning 'to prevent trouble before it happens' — act ahead of a problem rather than fix it after. Stronger in tone than the everyday phrase 提前准备.

idiom
to take preventive measures before trouble arisesto nip in the bud

Examples

  • 防患于未然，。
    Zuò rèn hé shì qing dōu yīng gāi fáng huàn yú wèi rán, tí qián zuò hǎo zhǔn bèi.
    In any undertaking, one should take precautions and prepare in advance.
  • 防患于未然，。
    Zhè cì shì gù tí xǐng wǒ men yào fáng huàn yú wèi rán, jiā qiáng ān quán cuò shī.
    This accident reminds us to take preventive measures and strengthen safety measures.
  • ，防患于未然，。
    Yǔ qí shì hòu bǔ jiù, bù rú fáng huàn yú wèi rán, bǎ fēng xiǎn jiàng dào zuì dī.
    Rather than fixing things after the fact, it's better to prevent trouble in advance and minimize risks.

Origin

Characters in this word

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

Meaning part形符xíngfú
阝Written in full as阜fù
Sound part声符shēngfú
方
方fāng防fáng
Same sound today

防 pairs 阝 (written fully as 阜) with 方, which gives the sound.

Open 防 →

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

Meaning part形符xíngfú
心心xīnheart
Sound part声符shēngfú
串
串chuàn患huàn
Close in sound todayThe sound part was a clue two thousand years ago — it often still helps, but not always.

患 is made from 心, a heart, plus 串, which gives the sound. Some old explanations also read the upper part as piercing through the heart.

Open 患 →

Two or more meaningful parts placed together so that their meanings combine into a new one.

  • 一一yīflat stream of air
  • 丂丂kǎoto exhale

The old shape of 于 may have pictured an ancient wind instrument. Another explanation reads 一 as a flat stream of air and 丂 as an exhaling mark.

Open 于 →

A drawing of the thing itself, worn down over three thousand years into a few strokes.

The shape 未 shows a tree with extra branches spreading above its trunk, like lush, overlapping limbs.

Open 未 →

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

Meaning part形符xíngfú
火火huǒfire
Sound part声符shēngfú
肰
肰rán然rán
Same sound today

然 is made from 肰, which gives the sound, and 火, which shows fire, matching the old sense 'to burn'.

Open 然 →

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