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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English poppere, equivalent to pop + -er (suffix forming agent noun). Etymology 1 sense 8 ("capsule of amyl nitrite") is derived from the popping sound when the capsule is broken open; from which etymology 1 sense 9 also derives.
Karl Popper, Sir Karl Raimund Popper
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Classic usage
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