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bodybuilding

or bod·y-build·ing, bod·y build·ing

[bod-ee-bil-ding]
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noun
  1. the act or practice of exercising, lifting weights, etc., so as to develop the muscles of the body.
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Origin of bodybuilding

1900–05; from the verb phrase build (up one's) body; see -ing1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for body building

body building

noun
  1. the practice of performing regular exercises designed to make the muscles of the body conspicuous
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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