Fleas in the mouth
Fleas in the mouth, a Chinese idiom, Pinyin K ǒ UZH ō ngz ǎ OSH ī, refers to the enemy who is easy to eliminate, just like the fleas in the mouth. So it is also called "lice in the mouth".
Pinyin
kǒuzhōngzǎoshī
explain
It refers to the enemy who is easy to destroy, just like the louse in the mouth. So it is also called "lice in the mouth". 
Classics
In Han Feizi's Qishu, when Wang was near Dongyang, there were lice in the mouth of Han Zhang. Biography of Wang Mang in the history of Han Dynasty: Han Weijin, the captain of the school, said: "swallow the Hu Lu with the power of the new room, and there are no fleas and lice in the strange mouth."
Discrimination
Synonym: louse in the mouth usage: as the subject and object; refers to the enemy easy to destroy.
Chinese PinYin : kǒu zhōng zǎo shī
Fleas in the mouth
be like birds flying in different directions. láo yàn fēn fēi
Take advantage of the danger. chéng xiǎn dǐ xī
Give up the easy and ask for the difficult. qì yì qiú nán
the extinction of a whole family. miè mén jué hù