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powder (one's) nose
A polite expression used, usually by women, when excusing oneself to the restroom. I'll join you at the table in a minute, I just need to powder my nose.
powder one's noseand powder one's face
to depart to the bathroom. (Usually said by women, or jocularly by men.) Excuse me, I have to powder my nose. She just went out to powder her face.