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Having legs that flare out at the bottom: bell-bottom pants.
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.
1. Also, bell′-bot`tomed. (of trousers) wide and flaring at the bottoms of the legs.n.
2. bell-bottoms, (used with a pl. v.) bell-bottom trousers.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.