to make your body bigger and heavier, especially by gaining more muscle

This season he has bulked up to 230 pounds. 这个赛季他增重最高到230磅。

to make something bigger or more powerful by adding to it

Several countries in the region are bulking up their military power. 这一地区的几个国家都在增强自己的军事实力。

If you travel light, you can always bulk up your wardrobe from local market stalls. 如果你轻装旅行，你随时可以到当地商铺那里购买添加衣物。

to add weight and size to your body, especially by gaining more muscle

Will Smith bulked up his body to play the part of Mohammad Ali. 威尔·史密斯为饰演穆罕默德·阿里而增重。