penknife a small pocketknife; originally used to cut quill pens
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Wiktionary
Substantiv
pocket knife -
Alternative spelling of pocketknife.
Wikipedia
A pocketknife is a folding knife with one or more blades that fit inside the handle that can still fit in a pocket. Blades can range from 1/2 inch to as much as 12 inches in length, but a more typical blade length is 2 to 6 inches. Pocketknives are versatile tools, and may be used for anything from opening an envelope, to cutting twine, to slicing an apple or even for self-defence.