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English definition of “pop-up”

pop-up

noun [C] (BASEBALL)    /ˈpɒp.ʌp/ US  /ˈpɑːp-/ (also pop fly)
in baseball, a ball that is hit very high in the air but not very farBaseball and roundersGeneral terms used in ball sports
(Definition of pop-up noun (BASEBALL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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