pop-in

[ pop-in ]
/ ˈpɒpˌɪn /

adjective

requiring only a quick insertion into a receptacle to be ready for use: pop-in film cassettes; a pop-in frozen dinner.

Origin of pop-in

adj. use of verb phrase pop in
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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