1. The act of securing, fastening, or tightening, with a lace or laces.
2. (Science: machinery) a lace; specifically, a thong of thin leather for uniting the ends of belts.
3. A rope or line passing through eyelet holes in the edge of a sail or an awning to attach it to a yard, gaff, etc.
4. (Science: engineering) a system of bracing bars, not crossing each other in the middle, connecting the channel bars of a compound strut.