What does "freshen up" mean?Any making-up activity involved?
In a sentence "I'm gonna freshen up", the lady then went to the bathroom, so I didn't get her exact meaning by this saying. Is there any make-up thing going on here?

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It usually means she's going to reapply her makeup so that she looks "fresh" again. A woman might want to do this before she meets with her boyfriend or someone important. That's why women's restrooms at movie theaters and restaurants are always more crowded than men's. ^_^

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In that context, it literally means "to get clean" so she is going to take a shower or do something to clean herself.
It can also mean "to become presentable", but that would be if she went to a wardrobe.

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Thank you everyone and I think I've got it now!Cheers!

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Go to the mirror to check the hair, the lipstick, the Mascara, and put on some perfume.

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Kat's right