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Proverb / Kotowaza

蟻の這い出る隙もない

ReadingありのはいでるすきもないRomajiari no haideru suki mo nai

Extremely strict security or surveillance where not a single gap remains.

Not even a gap for an ant to crawl out

Quick Answer

Extremely strict security or surveillance where not a single gap remains.

Literal Image
Not even a gap for an ant to crawl out
How to Use It
Used when describing a heavy police presence, tight security cordons, or very strict monitoring of a situation.

Meaning

Describes a state of perfect security or monitoring where not even the smallest thing can enter or exit unnoticed. It implies that every possible vulnerability has been addressed and closed.

Literal Image

Not even a gap for an ant to crawl out

How to Use It

Used when describing a heavy police presence, tight security cordons, or very strict monitoring of a situation.

Tone

descriptive or cautionary, emphasizing the completeness of the security.

Examples

01

警備員が多数配置され、蟻の這い出る隙もない警戒態勢が敷かれた。

With many security guards stationed, a high-alert posture was established so tight that not even an ant could crawl through.

Learning Notes

Key Vocabulary

Estimated LevelN2Confidence: High
Estimate, not an official JLPT list

Uses descriptive vocabulary like 'haideru' (crawl out) and 'suki' (gap). While the grammar is straightforward, the metaphorical application to security makes it a mid-to-high level idiom.

あり / ari

ant

這い出る

はいでる / haideru

to crawl out

すき / suki

gap; opening; space

Usage Profile

NeutralCautionary

Usage note: This is specifically about security and gaps, not general strictness in personality or rules unless they involve surveillance.

Misread Risk

Do not use this to describe someone who is busy (no time); it specifically refers to physical or metaphorical 'gaps' in security or a perimeter.

Search As

蟻の這い出る隙もないありのはいでるすきもないari no haideru suki mo naiarinohaiderusukimonaiari-no-haideru-suki-mo-naiari-no-ha-iderusuki-mo-nai蟻の這い出る隙もない ありのはいでるすきもないari no ha iderusuki mo nai

Kanji in This Proverb

Related Proverbs

Similar水も漏らさぬ
Similar鉄壁の守り
Similar完全な包囲
Similar完璧な配備

Origin

This expression originates from the image of a perimeter or defense being so flawlessly tight that even a creature as tiny as an ant would find no way to pass through it.

Index

Topics, Situations, and Tags

01

Topics

Caution and RiskStrategy and Action
02

Situations

Warn Someone
03

Tags

🐾Animals & Nature⚠️Warnings & Caution

Source Note

Where did this entry get its data from? The reference links are listed below. To understand how to read this section, see Data Sources.

Published
2026-03-15
Updated
2026-05-08
Source 1: tomomi965.comAbout Data SourcesReport a Correction

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