knife (n.) Look up knife at Dictionary.com
late Old English cnif, probably from Old Norse knifr, from Proto-Germanic *knibaz (cognates: Middle Low German knif, Middle Dutch cnijf, German kneif), of uncertain origin. To further confuse the etymology, there also are forms in -p-, such as Dutch knijp, German kneip. French canif "penknife" (mid-15c.) is borrowed from Middle English or Norse.
knife (v.) Look up knife at Dictionary.com
1865, from knife (n.). Related: Knifed; knifing.