蔓延る

• Reading: はびこる
• Romaji: habikoru
• Kanji breakdown: 蔓 (man/tsuru) — vine, tendril; 延 (en/no) — extend, spread
• Pronunciation: /ha.bi.ko.ɾɯ/

Meaning

To spread unchecked; to flourish excessively; to run rampant; to be pervasive. Used for negative phenomena spreading beyond control.

A Group 1 (godan) verb typically used for harmful or unwanted phenomena spreading beyond control — weeds overgrowing, corruption spreading, harmful ideologies proliferating. The nuance carries a judgment that the spreading is excessive and should be checked but isn't. Unlike 広まる (to spread, neutral), 蔓延る implies something invasive and difficult to contain.

Examples

1. 都市部では詐欺的な商法が蔓延り、多くの高齢者が被害を受けた。 Fraudulent business practices ran rampant in urban areas, victimizing many elderly people.
2. 手入れされない庭には雑草が蔓延り、見る影もなくなっていた。 Weeds had spread unchecked through the neglected garden, leaving it unrecognizable.
3. 腐敗が組織全体に蔓延るようになると、内部から崩壊が始まる。 When corruption pervades an entire organization, collapse begins from within.

Usage Guide

Context: society, politics, nature, corruption

Tone: negative

Origin & History

Likely related to 蔓 (tsuru, vine/tendril), evoking the image of vines spreading unstoppably and choking everything around them. The word captures the invasive, difficult-to-stop nature of something growing outward and taking over its surroundings.

Cultural Context

Era: Modern

Generation: Adults

Social background: Universal