Meaning of bulk sth up In English

• 0 to make something bigger or more powerful by adding to it:

  • Several countries in the region are bulking up their military power.

  • If you travel light, you can always bulk up your wardrobe from local market stalls.

• 1 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.