The phrase "do up" is a phrasal verb in English that has a couple of meanings and uses. Let's break it down to make it easier to understand.
To Dress or Prepare: "Do up" can mean to get dressed nicely or to make oneself look good. For example, when someone spends time putting on makeup, fixing their hair, or wearing fancy clothes for an occasion, they are "doing up" for that event.
To Wrap or Decorate: "Do up" can also mean to wrap something, often in a decorative way, like a gift.
"Do up" is a versatile phrasal verb that can mean to dress nicely, to wrap something, or to renovate something. It is commonly used in everyday conversations, especially in informal contexts.