


The slang meaning "bunk, bed" is by 1825, originally nautical, hence many slang phrases, originally nautical, such as sack duty "sleep " the verb meaning "go to bed" is recorded from 1946. For example, suggest bike as a synonym for bicycle, or sock for socks. The baseball slang sense of "a base" is attested from 1913. In English, the meaning "a sack or sack material used as an article of clothing" as a token of penitence or mourning is from c. Knapsack definition: A knapsack is a canvas or leather bag that you carry on your back or over your shoulder. English synonyms: knapsack, rucksack, backpack, back pack, haversack, packsack Synonyms:, A. Pack noun - A soft-sided case designed for carrying belongings especially on the back. In some cases you can use 'Pack' instead a noun 'Knapsack', when it comes to topics like rucksack, thing, case, package.

The wide spread of this word for "a bag" probably is due to the incident in the Biblical story of Joseph in which a sack of corn figures (Genesis xliv). A bag carried by a strap on your back or shoulder. Pack is a synonym for knapsack in backpack topic. "large oblong bag," Middle English sak, from Old English sacc (West Saxon), sec (Mercian), sæc (Old Kentish) "large cloth bag," also "sackcloth," from Proto-Germanic *sakkiz (source also of Middle Dutch sak, Old High German sac, Old Norse sekkr, but Gothic sakkus probably is directly from Greek), an early borrowing from Latin saccus (also source of Old French sac, Spanish saco, Italian sacco), from Greek sakkos "bag (made of goat hair) sieve burlap, large burlap cloak," which is from Semitic (compare Hebrew, Phoenician saq "sack, cloth of hair, bag, mourning-dress").
