keep stiff upper lip

Medical Dictionary

lip (lĭp)
n.

  1. Either of two fleshy folds that surround the opening of the mouth.

  2. A liplike structure bounding or encircling a bodily cavity or groove.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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