One of the mysteries of the English language finally explained.
1Aeronautics. A manoeuvre in which an aircraft in level flight loses altitude and then resumes level flight. rare.
2Computing and Linguistics. A push-down store or list.
1Computing and Linguistics. Designating a linear store or list that receives and loses items at one end only, the first to be removed being always the last to have been added; relating to or employing such a store or list.
2That may be, or is designed to be, pushed down.
1930s; earliest use found in Journal of the Royal Aeronautical Society. From push + down, after to push down.
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