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powder (one's) nose
euphemism To go to the bathroom. The phrase is a polite expression used to excuse oneself when going to the bathroom. Typically used by women. I'll join you at the table in a minute, I just need to powder my nose.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.