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n. mouth (of human or animal); entrance, opening; edge of a knife; age of a draught animal
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口 vs 嘴

口 and 嘴 both have a lot of different meanings and parts of speech, but both can mean "mouth (of a human being or animal)".

When 口 and 嘴 both mean "mouth (of a human being or animal)", 口 is more formal and 嘴 is informal. 口 usually appears in words or idioms, while 嘴 can be used independently a noun.

For example, when 口 appears in idioms, we cannot use 嘴 to replace it:
守口如瓶 [idiom] to keep one's mouth shut as that of a jar, to be tight-lipped
张口结舌 [idiom] be at a loss for words, be agape and tongue-tied

嘴 used independently as a noun, e.g.
- 一张嘴 [phr] a mouth
- 闭嘴 [v] shut up
- 张嘴 [v] open ones mouth, speak, ask for (a favor, etc.)

嘴 can also appears in idioms, and needless to say that because idioms are fixed terms, we cannot replace it with 口:
- 狗嘴里吐不出象牙 [idiom] a dog does not grow elephant tusk in its mouth -- look not for musk in dog's kennel
- 牛头不对马嘴 [idiom] A horse's jaw doesn't match a cow's head -- incongruous, irrelevant

They are paired habitually with other words and in most cases they are not interchangeable. You will have it memorize them one by one.
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What other words can mean "口" (kǒu)?
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What is the difference between 口 (kǒu) and 嘴 (zuǐ) in terms of usage?
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