Chaser
n.
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One who or that which chases; a pursuer; a driver; a hunter.
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Same as Chase gun, esp. in terms bow chaser and stern chaser. See under Bow, Stern. (Naut.)
Chaser
n.
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One who chases or engraves. See 5th Chase, and Enchase.
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A tool with several points, used for cutting or finishing screw threads, either external or internal, on work revolving in a lathe. (Mech.)