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lock·stitchalso lock stitch (lŏk′stĭch′)
A stitch made on a sewing machine by interlocking the upper thread and the bobbin thread.
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.
(Knitting & Sewing) a sewing-machine stitch in which the top thread interlocks with the bobbin thread
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a sewing-machine stitch in which two threads are locked together at small intervals.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.