膝盖 xīgài knee
knee; (Internet slang) to kneel down (in admiration)
How to remember 膝盖: 膝 knee + 盖 to cover = knee.
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How it is used
- The knee - 跪在地上，膝盖很疼 (guì zài dìshang, xīgài hěn téng) kneeling on the ground, my knees ache.
- The everyday word for the body part; 膝盖 is the joint, 大腿/小腿 the thigh/calf.
- Internet slang: 膝盖中了一箭 / 献出膝盖 = to kneel in admiration.