penknife
/ˈpɛnˌnaɪf/Definitions
1. noun
a small, folding knife, typically carried by a writer or artist, used for cutting paper, etc.
“She used her penknife to cut the tag off her new sweater.”
2. noun
a small, versatile knife used for various purposes, especially in a pocket or on a person.
“He kept a penknife in his pocket for emergencies.”