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bouldering

or bowl·der·ing

[bohl-der-ing]
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noun
  1. pavement made with small boulders.

Origin of bouldering

1875–80; boulder to pave with boulder(s) + -ing1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for bouldering

bouldering

noun
  1. rock climbing on large boulders or small outcrops either as practice or as a sport in its own right
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