( 125 ) 乘虚而入 take advantage of the weak oversight.

成语 idiom :             

                                           乘 虚 而 入
发音 pronunciation : chéng xū ér rù

释义Interpretation :
乘：趁 take chance / take advantage

趁着虚弱疏漏的地方进入。
take advantage of the weak oversight.
 
出处 source :《去笈七签》

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示例Example :
若各存意见，不能和睦，是自己先孤了，别人安得不乘虚而入。
If each saves own opinions, can't live in harmony, is the first to keep self-solitary, people will take advantage of the weak oversight.

出处 source：
清·李汝珍《镜花缘》第七十四回

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成语近义词 Idiom Synonyms :

有隙可乘
there is a crack to take use of

乘人之危
take advantage of others' difficulties

成语反义词 Idiom Antonyms :
坐失良机
Don't miss the boat / don't miss the chance

无隙可乘
there is no crack to take use of
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{ 乘人之危
take advantage of others' difficulties } this is not a good moral attitude.

只有小人才会那样做。
Only the villains may do that.