Meaning of xī gài:
xī gài
膝盖
Noun
knee; (Internet slang) to kneel down (in admiration)
Wǒ de xīgài shòushāngle.
我的膝盖受伤了。
My knee is injured.
Tā de gēshēng tài měimiào le, wǒ rěnbuzhù guì xià xiàng tā xīgài.
他的歌声太美妙了，我忍不住跪下向他膝盖。
His singing is so wonderful that I can't help but kneel down in admiration.
