knack
noun
Origin
Late Middle English, use as "special skill" from 1580. Possibly from 14th century Middle English krak, knack (“a sharp sound or blow”), knakke, knakken, from Middle Low German and of imitative origin, similar to Dutch knak (“snap, crack”). Latter cognate to German knacken (“to crack”). See also crack.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.