Unpack

wiktionary

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From Middle English unpakken, equivalent to un- +‎ pack. Compare Saterland Frisian uutpakje(“to unpack”), West Frisian útpakke(“to unpack”), Dutch uitpakken(“to unpack”), German auspacken(“to unpack”).

etymonline

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unpack (v.)

late 15c., from un- (2) "reverse, opposite of" + pack (v.). Similar formation in Dutch ontpakken. Related: Unpacked; unpacking.