در لباس پوشیدن به معنی همه چی تمام و عالی پوشیدن است. 
 
 - "She was all done up in a designer dress and elegant jewelry for the charity gala. " 
 - "He always looks done up, even when he's just running errands in his casual clothes. "  
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 - "The bride was beautifully done up with a stunning gown, intricate hairstyle, and flawless makeup for her wedding day. " 
In these examples, "done up" suggests that the person's appearance is well - thought - out, stylish, and appropriately attired for the occasion, indicating that they've taken care to present themselves in the best possible light. 
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ببینید معنای لغویش که بعضی جاها استفاده میشه به معنای "تمام شده" هست اما اصطلاحا معنای خوب دکور شدن یا تزیین شدن رو هم میده مثلا :
My room is done up nicely 
خسته، بی رمق، از پا افتاده
تمام شده، کامل شده