1the waist and lower back
2kidney of an animal (as food)
3the waist of trousers or a skirt
4(metonym) money pouch; pocket
5the middle section of an upright object (mountain, bottle etc)
Examples
wǒ我yāo腰téng疼，bù不néng能dǎ打wǎng qiú网球。
我腰疼，不能打网球。
My back hurts; I can't play tennis.
我们爬到了半山腰。
We went halfway up the mountain.
你的腰带是什么颜色？
What color is your belt?