n. Any work, especially ornamental work, so made or manufactured as to show openings through its substance; specifically, fancy work done with thread of different kinds, such as knitting, netting, lace, and many kinds of embroidery; decoration of the simplest sort made with small openings set in regular patterns.n. In fortification, a work or fortification which is not protected at the gorge by a parapet or otherwise.n. In mining, a place where mining or quarrying is done open to the air, or uncovered by rock or earth. Also called open working and open-cast.