Basic Info
Chinese Idiom: 千里之堤，溃于蚁穴
Pinyin: qiān lǐ zhī dī, kuì yú yǐ xué
Literal meaning: “A thousand‑mile dike collapses because of an ant hole.”
(千里 = a thousand li / a very long distance; 之 = of; 堤 = dike / embankment; 溃 = to collapse / burst; 于 = because of / at; 蚁穴 = ant hole / ant nest)
Figurative Definition
It means that a tiny, neglected flaw or hidden danger can lead to a catastrophic disaster. A massive embankment may seem invincible, but a single ant hole – if ignored – can let water seep in, weaken the structure, and eventually cause the entire dike to burst.
The idiom warns against underestimating small problems. Minor errors, small leaks, tiny cracks in a system, or seemingly insignificant bad habits can accumulate and bring down something enormous – a project, a company, a relationship, or even a nation.
Cultural & Historical Origin
This idiom comes from the Legalist classic Han Feizi (《韩非子》), in the chapter “Illustrating Laozi” (喻老).
The original passage says:
千丈之堤，以蝼蚁之穴溃；百尺之室，以突隙之烟焚。
A dike a thousand zhang high collapses because of a hole made by ants; a room a hundred chi tall burns down because of a spark from a chimney crack.
Han Feizi was illustrating a Daoist idea: small causes can produce enormous effects. The image of the ant hole in the dike became the most famous part of this passage and evolved into the idiom “千里之堤，溃于蚁穴.”
Key Lesson
Do not ignore small problems. Great disasters often begin with tiny, overlooked flaws. A wise person or leader pays attention to details, fixes small issues early, and never assumes that something “too small to matter” is harmless. Prevention is always cheaper than repair.
Cultural Note
In modern Chinese, this idiom is widely used in engineering, management, politics, and personal development:
Engineering: A tiny crack in a dam or bridge must be repaired immediately.
Business: Small accounting errors or minor ethical lapses can destroy a company.
Governance: Corruption or negligence at a low level can undermine an entire institution.
Personal life: Small bad habits can ruin health, relationships, or careers.
It is closely related to “防微杜渐” (fáng wēi dù jiàn – “to nip problems in the bud”) and “千里之堤，以蝼蚁之穴溃” (the fuller classical form).
Similar English Expressions
- A small leak will sink a great ship. – A tiny problem can destroy something large.
- For want of a nail, the kingdom was lost. – Small omissions lead to disaster (from a famous proverb).
- Nip it in the bud. – Stop a small problem before it grows.
- The straw that broke the camel’s back. – A small final burden causes total collapse (focuses on the last straw, not the accumulated damage).
- A chain is only as strong as its weakest link. – One weak point can ruin the whole.
- Little things add up. – Small issues accumulate into big consequences.
- A stitch in time saves nine. – Fixing a small problem early prevents a bigger one.
The closest and most vivid equivalent is “A small leak will sink a great ship” or “For want of a nail, the kingdom was lost.”
Leave a Reply