Meaning of kāi kǒu:
kāi kǒu
开口
Verb
to open one's mouth; to start to talk
Tā hěn hàixiū, bù gǎn kāikǒu shuōhuà.
他很害羞，不敢开口说话。
He is very shy and doesn't dare to open his mouth to speak.
Tā yóuyù le hěn jiǔ cái kāikǒu.
他犹豫了很久才开口。
He hesitated for a long time before starting to talk.
