有口难辩

Explanation: Although there are ports, it is difficult to differentiate clearly. Often refers to the wronged and aggrieved but no complaints. 　　Usage: -Linked; as predicate, object, attribute; that are hiding something 　　Source: Ming Feng Meng, "Yu Shiming words," Ms. Meng a mouth Nanbian, which he wrapped himself down, not leave. " 　　Examples: Evidence, evidence, ~, arrested and brought into prison to go, sentenced to fifteen years. ★ Shu-Shen "Zhengqi Ge" Thesaurus:  secret act, unable to give a convincingexplanation for self-defense, Tibetan monkeys Mountain, Stealthy, Peru without speaking, be hard to state what ails one in the mird, stick in one's throat, A mouth wordless, Bitter wordless, There I was difficult to separate