The difference between Pack and Unpack
When used as verbs, pack means to make a pack of, whereas unpack means to remove from a package or container, particularly with respect to items that had previously been arranged closely and securely in a pack.
Pack is also noun with the meaning: a bundle made up and prepared to be carried.
check bellow for the other definitions of Pack and Unpack
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Pack as a noun:
A bundle made up and prepared to be carried; especially, a bundle to be carried on the back, but also a load for an animal, a bale
Examples:
"The horses carried the packs across the plain."
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Pack as a noun:
A number or quantity equal to the contents of a pack
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Pack as a noun:
a multitude.
Examples:
"a pack of lies"
"a pack of complaints"
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Pack as a noun:
A number or quantity of connected or similar things; a collective.
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Pack as a noun:
A full set of playing cards; also, the assortment used in a particular game
Examples:
"We were going to play cards, but nobody brought a pack."
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Pack as a noun:
A number of hounds or dogs, hunting or kept together.
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Pack as a noun:
A wolfpack: a number of wolves, hunting together.
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Pack as a noun:
A number of persons associated or leagued in a bad design or practice; a gang.
Examples:
"a pack of thieves or knaves"
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Pack as a noun:
A group of Cub Scouts.
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Pack as a noun:
A shook of cask staves.
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Pack as a noun:
A bundle of sheet-iron plates for rolling simultaneously.
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Pack as a noun:
A large area of floating pieces of ice driven together more or less closely.
Examples:
"The ship had to sail round the pack of ice."
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Pack as a noun (medicine):
An envelope, or wrapping, of sheets used in hydropathic practice, called dry pack, wet pack, cold pack, etc., according to the method of treatment.
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Pack as a noun (slang):
A loose, lewd, or worthless person.
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Pack as a noun (snooker, pool):
A tight group of object balls in cue sports. Usually the reds in snooker.
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Pack as a noun (rugby):
The team on the field.
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Pack as a verb (physical):
To put or bring things together in a limited or confined space, especially for storage or transport. To make a pack of; to arrange closely and securely in a pack; hence, to place and arrange compactly as in a pack; to press into close order or narrow compass. To fill in the manner of a pack, that is, compactly and securely, as for transportation; hence, to fill closely or to repletion; to stow away within; to cause to be full; to crowd into. To envelop in a wet or dry sheet, within numerous coverings. To render impervious, as by filling or surrounding with suitable material, or to fit or adjust so as to move without giving passage to air, water, or steam. To make up packs, bales, or bundles; to stow articles securely for transportation. To admit of stowage, or of making up for transportation or storage; to become compressed or to settle together, so as to form a compact mass. To gather in flocks or schools. To combine (telegraph messages) in order to send them more cheaply as a single transmission.
Examples:
"to pack goods in a box;  to pack fish"
"to pack a trunk;  the play, or the audience, packs the theater"
"The doctor gave Kelly some sulfa pills and packed his arm in hot-water bags."
"to pack a joint;  to pack the piston of a steam engine;  pack someone's arm with ice."
"the goods pack conveniently;  wet snow packs well"
"the grouse or the perch begin to pack'"
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Pack as a verb (social):
To cheat, to arrange matters unfairly. To sort and arrange (the cards) in a pack so as to secure the game unfairly. To bring together or make up unfairly and fraudulently, in order to secure a certain result. To contrive unfairly or fraudulently; to plot. To unite in bad measures; to confederate for ill purposes; to join in collusion.
Examples:
"to pack a jury"
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Pack as a verb (transitive):
To load with a pack; hence, to load; to encumber.
Examples:
"to pack a horse"
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Pack as a verb (transitive):
To move, send or carry. To cause to go; to send away with baggage or belongings; especially, to send away peremptorily or suddenly; – sometimes with off. See pack off. To transport in a pack, or in the manner of a pack (i. e., on the backs of men or animals). To depart in haste; – generally with off or away. To carry weapons, especially firearms, on one's person.
Examples:
"to pack a boy off to school"
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Pack as a verb (transitive, sports, slang):
To block a shot, especially in basketball.
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Pack as a verb (intransitive, LGBT, _, slang, of a [[drag king]], [[transman]], etc.):
To wear a prosthetic penis inside one's trousers for better verisimilitude.
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Unpack as a verb (transitive):
To remove from a package or container, particularly with respect to items that had previously been arranged closely and securely in a pack.
Examples:
"They didn't have time to unpack their bags before going out to dinner."
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Unpack as a verb (intransitive):
To empty containers that had been packed.
Examples:
"They didn't have time to unpack before going to dinner."
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Unpack as a verb (transitive):
To analyze a concept or a text.
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Unpack as a verb (linguistics, of a segment such as a vowel):
To undergo separation of its features into distinct segments.
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Unpack as a verb (computing, transitive):
To decompress.