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Using 口 (kǒu) to express "opening" or "mouth"
Location & Position
Topic & Focus
Structure
Noun + 口
Explanation
口 (kǒu) means "mouth" or "opening" and when used after nouns like 洞 (hole) or 门 (door), it indicates the entrance or opening of that space. It functions as a suffix to specify the access point of an enclosed area.
Examples
洞口太小了，我们过不去。
dòngkǒu tài xiǎo le, wǒmen guò bù qù.
The hole's entrance is too small; we can't get through.
你在地铁站哪个出口等我？
nǐ zài dìtiě zhàn nǎ gè chūkǒu děng wǒ?
Which exit of the subway station are you waiting for me at?
他站在门口等了半个小时。
tā zhàn zài ménkǒu děng le bàn gè xiǎoshí.
He stood at the doorway and waited for half an hour.