Dictionary.com
definitions

bell-bottom

[bel-bot-uh m]
adjective
  1. Also bell-bot·tomed. (of trousers) wide and flaring at the bottoms of the legs.
noun
  1. bell-bottoms, (used with a plural verb) bell-bottom trousers.

Origin of bell-bottom

First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for bell-bottoms

bell-bottoms

pl n
  1. trousers that flare from the knee and have wide bottoms
Derived Formsbell-bottomed, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012