a small, often decorative, knifelike instrument with a blade of metal, ivory, wood, or the like, for slitting open envelopes, the leaves of books, folded papers, etc.
the blade of a paper cutter.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use paper knife in a sentence
Mrs. Falchion had picked up a paper knife and was bending it to and fro between her fingers.Mrs. Falchion, Complete | Gilbert Parker
Quin traced the pattern in the table-cover with a massive brass paper-knife.Quin | Alice Hegan Rice
He took up a paper-knife from the table, and began to bend it in his hands.That Lass O' Lowrie's | Frances Hodgson Burnett
He took up his dagger paper-knife, tried its point on his palm with two or three reckless thrusts and threw it back on the desk.The Eternal City | Hall Caine
A chubby-faced office-boy, opening envelopes with a sharp steel paper-knife, was the only person to be seen.The Silver Poppy | Arthur Stringer
British Dictionary definitions for paperknife
a knife with a comparatively blunt blade, esp one of wood, bone, etc, for opening sealed envelopes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012