Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Origin: Perhaps from Dutch or Low German knak '(sound of) a sudden blow', from the sound

knack

noun
     
knack informal
1 [singular] a natural skill or ability [↪ talent]
knack for doing something
Some people seem to have a knack for making money.
knack of doing something
Thomson's knack of scoring vital goals makes him important to the team.
2

have a knack of doing something

British English to have a tendency to do something:
He has a knack of saying the wrong thing.

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