Proto-Germanic: *knappa-, *knappian- vb., *knappa-z
Meaning: narrow, short
Old Norse: knapp-r `krapp, von kurzen Wellen'; kneppa wk. `klemmen, kneifen'; knapp-r m. `Knopf'
Norwegian: knapp `enge, kurz, knapp'; kneppa vb.; knapp `Knopf'
Swedish: knapp adj.; dial. knäpp; dial. knapp `Knopf'
Danish: knap `kärglich, spärlich'; knap `Knopf'
Old English: cnäp `Spitze, Kopf, Spange'
Old Frisian: knapp `Hügel; Absatz am Schuh'
Dutch: { knap `eng anschliessend; spärlich; schnell; klug' }
Middle Low German: knapp `gering, kurz, sparsam, hurtig'; knapp `Hügel; Absatz am Schuh'
Comments: Also various 'knobs'.
