overlock /ˈəʊvəˌlɒk/verb 2noun 1forms 3 verb2 •To stitch in this manner. •To make the bolt of a lock go too far.The way to open it, then, is to turn the key the other way, as if to overlock the bolt […] — 1857 noun1 •A stitch that sews over the edge of one or two pieces of cloth for edging, hemming or seaming. formsoverlocked · overlocking · overlocks