Your mouth is an enclosure for your tongue.
A mouth is an enclosure for your food.
When a mouth is open it looks like a box.
When you said, your mouth is opening and the shape of mouth like a circle. A circle in Chinese character was described by a square.
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Definitions for 口 pronounced as kǒu
- classifier for things with mouths (people, domestic animals, cannons, wells etc)
- classifier for bites or mouthfuls
- a person's preferences
- tastes (in food)
- to import