zzz Used primarily in written form to suggest the sound of snoring or the activity of sleeping. Often occurs with more than three z’s.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.zzz (zi?z) ninformal sleepCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014ZZZ or zzz, (used to represent the sound of a person snoring.) Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.ZZZBored (or tired)Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited