Entry 4 senses · 2 variants Webster, 1913 Chaser /chās'-ẽr/ · Chas·er · IPA /ˈt͡ʃeɪsɚ/ n. n. 01 n. One who or that which chases; a pursuer; a driver; a hunter. 1. One who or that which chases; a pursuer; a driver; a hunter. 2. Same as Chase gun, esp. in terms bow chaser and stern chaser. See under Bow, Stern.(Naut.) See: Chase gun, Bow, Stern 02 n. One who chases or engraves. See 5th Chase, and Enchase. 1. One who chases or engraves. See 5th Chase, and Enchase. See: Chase, Enchase 2. A tool with several points, used for cutting or finishing screw threads, either external or internal, on work revolving in a lathe.(Mech.)