Meaning of “pump-action” in the English Dictionary

british dictionary

"pump-action" in British English

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pump-actionadjective [ before noun ]

uk /ˈpʌmp.æk.ʃən/ us /ˈpʌmp.æk.ʃən/

used to refer to a device that operates by forcing something, especially air, in or out of a closed space or container:

a pump-action shotgun
a pump-action toilet

(Definition of “pump-action” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)