Definition: "Use up" is a phrasal verb that means to consume all of something until there is none left. It often refers to resources, materials, or supplies.
While "use up" primarily refers to consuming resources, it can also imply exhausting one's energy or time in certain contexts.
Run out of: This means to have no more of something left.
Consume: This is a more formal synonym that refers to using up resources.
In more advanced contexts, "use up" can also be used metaphorically to describe emotional or mental exhaustion.
"Use up" is a versatile phrasal verb that indicates the complete consumption of resources or materials.