Meaning 1 · most common
wear smart or special clothes
To put on clothes that are more formal or nicer than usual, often for a special occasion.
Examples
You don’t need to dress up for the barbecue; jeans are fine.
A: Are you going to dress up for the party tonight?
B: Yeah, I think I’ll wear my new suit.
Common mistake
Not: Do I need to dress up myself?
Say: Do I need to dress up?
'Dress up' is intransitive — no reflexive 'myself'.
More on “wear smart or special clothes”Another example · Tell it apart · Goes with · Tip
Another example
In my country, people usually dress up for weddings and other important celebrations.
Tell it apart
Everyone dressed up for the wedding.
The kids dressed up as superheroes.
Goes with
- dress up (for)