Meaning of kǒu:
kǒu
口
Noun
mouth
Tā yǒu yīgè hěn dà de kǒu.
他有一个很大的口。
He has a very big mouth.
Measure Word
classifier for things with mouths (people, domestic animals, cannons, wells etc); classifier for bites or mouthfuls
Wǒ jiālǐ yǒu wǔ kǒu rén.
我家里有五口人。
There are five people in my family.
Tā chī le yī kǒu dàngāo.
他吃了一口蛋糕。
He took a bite of the cake.