Sniper
来自Big Physics
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wiktionary
snipe + -er
etymonline
sniper (n.)
"sharpshooter; one who shoots from a hidden place," 1824, agent noun from snipe (v.). The birds were considered a challenging target for an expert shooter:
Snipe Shooting is a good trial of the gunner's skill, who often engages in this diversion, without the assistance of a dog of any kind; a steady pointer, however, is a good companion. [Sportsman's Calendar, London, December 1818]
