no-go (n??g??)adj. Not in a suitable condition for proceeding or functioning properly: The space launch was no-go.n. pl. no-goes A situation in which planned operations cannot be effectuated, as in the case of the launch of spacecraft: The flight is a no-go because of technical problems.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.no-go adj something which is not working properly or which cannot go ahead Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014no?-go? adj. 1. not functioning properly; not ready to proceed. 2. denying permission to proceed: a go or no-go decision. [1865?70] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.