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round down

verb
  1. (tr, adverb) to lower (a number) to the nearest whole number or ten, hundred, or thousand below itCompare round up (def. 2)
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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