Knack
. Skill in handiwork. The derivation of this word is a great puzzle. Minshew suggests that it is a mere variant of knock. Cotgrave thinks it a variant of snap. Others give the German knacken (to sound).
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.