蚁穴溃堤

Explanation: Small ants, to make the embankment burst. Metaphor not pay attention to little things, will be out of big trouble. 　　Usage: The main predicate; as object, attribute; containing derogatory 　　Source: San Guowei should Qu "Miscellaneous Poems" minor may inadvertently, embankment collapse from the colony. " Thesaurus:  Congqingzhezhou, Yu Shen Zhou plot, accumulation of straw break the camel's back, An ants' nest Bad dike