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The definition of a quack is the sound a duck makes, or a person who claims to have a specific skilled that he does not have. An example of a quack is what you'll likely hear at a duck park. An example of a quack is a fake doctor. Quack is defined as to make the noise of a duck.
1. rucksack-a bag carried by a strap on your back or shoulder. back pack, backpack, haversack, knapsack, packsack. bag-a flexible container with a single opening; he stuffed his laundry into a large bag. kit bag, kitbag-a knapsack (usually for a soldier).ucksack. n. 1. a large bag, usually having two straps and a supporting frame, carried on the back and often used by climbers, campers, etc. US and Canadian name: backpack. [C19: from German, literally: back sack].