One of the mysteries of the English language finally explained.
1A sliding motion or action; a mechanism (especially on a firearm) which delivers such a motion or action.
2Originally and chiefly US. A slide-action firearm; = "pump-action".
Originally and chiefly US. Designating a repeating firearm in which a new round is brought from the magazine into the breech by a slide action.
Mid 19th century; earliest use found in Scientific American. From slide + action.
slide action/ˈslʌɪd ˌakʃn/
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