Noun
A knife with one or more blades, which fold into the handle so as to admit of being carried in the pocket.
Source: Webster's dictionaryBlackburn was covered in blood and had a pocketknife that also had blood on it, police said in the court record. Source: Internet
My namesake and great uncle, Sidney Leavell, gave me my first pocketknife when I was a little boy in the early 1940s. Source: Internet
Nobody knows this, so do not let it get around, but I have a small pocketknife collection. Source: Internet