千丈せんじょうの堤つつみも蟻ありの一穴いっけつより崩くずれる Idiom 1a small leak will sink a great ship Translated by Jiyomi expressions (phrases, clauses, etc.) · Ichidan verb Kanji · tap to open thousand length dike ant one hole crumble JMdict entry 2418680. Source and licence.