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Related to cocktail dress: H&M
A semiformal dress that usually falls at or near the knees.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A woman’s short dress designed for wearing at semiformal occasions such as cocktail parties.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited