/ Dictionary / Index L lock stitch: Meaning and Definition of Find definitions for: lock' stitch" Pronunciation: [key] a sewing-machine stitch in which two threads are locked together at small intervals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lockstitch (Thesaurus) lockstep lockup Related Content Daily Word Quiz: ablution Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language