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Related to test-fly: Flight test
vb (tr) , -flies, -flying, -flew or -flown
(Aeronautics) to fly (a plane or rocket) for the first time in order to test its equipment
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
v.t. -flew, -flown, -fly•ing.
to fly (an aircraft or spacecraft) in order to evaluate performance.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Past participle: test-flown
Collins English Verb Tables © HarperCollins Publishers 2011