knapsack

/ˈnæpsæk/
noun

Meaning

A case of canvas or leather, for carrying items on the back.
A set of values from which a subset is chosen.
A case of canvas or leather, for carrying items on the back.
To go hiking while burdened with a knapsack, usually overnight or for longer.

Examples

1936, Arthur Ransome, Pigeon Post, ch 3. "All but Nancy carried knapsacks, with sandwiches and thermos flasks of tea. Peggy’s knapsack held Nancy’s provisions as well as her own, for on Nancy’s shoulders, instead of a knapsack, was a pigeon-basket […]"
The two elder reluctantly left him and walked on, taking their brother's knapsack to relieve him in following, and the youngest entered the field.
My sleeping bag fell off my backpack into the water, while we were knapsacking up the mountain.

Word Forms

knapsacks knapsacking knapsacked

Etymology

From Low German knapzak or Dutch knapzak (older form cnapsack), from Middle Dutch cnappen (“to bite with teeth”), ultimately from knappen (“to eat, crack”), of imitative origin, + sack. German Knappsack is from Dutch.

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