matchlock UK /ˈmatʃlɒk/US /ˈmæt͡ʃlɑk/ noun2 •(historical) Early type of firearm, using a smoldering piece of cord to fire the powder in the firing pan.I crept silently up the hill-road, but the fuse of my matchlock was wetted with the rain, and I could not slay Daoud Shah from afar. — 1888 •The gunlock used in such a weapon, having a slow smouldering match. formsmatchlocks