All dressed up—dressed formally; dressed in one’s best clothes.
- She was glad that she was all dressed up and had done her hair that morning.
Dressed up—
1. = all dressed up.
- We know little about Mary’s appearance (the only description we have is when she is dressed up for her daughter’s wedding).
2. wearing fancy clothing; disguised.
- There was a carnival parade in the city. Annabel was dressed up as a clown and Andy as Zorro.