I. ˈnapˌsak noun
Etymology: Low German knappsack or Dutch knapzak, from Low German & Dutch knappen to make a snapping noise, bite into, eat + Low German sack (from Middle Low German sak ) & Dutch zak bag, sack, from Middle Dutch sac — more at knap , sack
1. : a bag or case often of canvas supported on the back by a strap over each shoulder and used especially for carrying supplies while on a march
2. or knapsack tank : a container equipped with pressurizing and spraying devices, carried on the back, and used to transport materials (as insecticides or fire-extinguishing chemicals) to the point of application
II. verb
( -ed/-ing/-s )
transitive verb
: to equip with a knapsack
knapsacked travelers
intransitive verb
: to travel on foot dependent for supplies on the contents of a knapsack