persist in

persist in working hard

v fill or close tightly with or as if with a plug v persist in working hard v deliver a quick blow to v make a plug for

n blockage consisting of an object designed to fill a hole tightly n a wad of something chewable as tobacco n blatant or sensational promotion n electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark n an electrical device with two or three pins that is inserted in a socket to make an electrical connection n an upright hydrant for drawing water to use in fighting a fire n an old or over-worked horse v fill or close tightly with or as if with a plug v persist in working hard v deliver a quick blow to v make a plug for