/ Dictionary / Index M middle guard: Meaning and Definition of Find definitions for: mid'dle guard' Pronunciation: [key] a defensive lineman positioned opposite the offensive center and between the defensive tackles, as in a three- or five-man line. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. middle ground middlehand Related Content Daily Word Quiz: reluctant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language