mid-14c., "deception, trick, device," of uncertain origin, probably from a Low German word meaning "a sharp sounding blow" (compare Middle English knak, late 14c.; German knacken "to crack"), of imitative origin. Sense of "special skill" is first recorded 1580s, if this is in fact the same word. In old slang (mid-18c.-mid-19c.) nacky meant "full of knacks; ingenious, dexterous."
例文
1. She has a knack of landing herself right in the soup.
彼女はいつも自分の立場を気まずいものにしている。
2. "I have a knack for making friends, you know," she added meaningfully.
「私は友達を作るのにセットがあることを知っています」と彼女はわざと付け加えた。
3.It 's easy,once you 've got the knack .
このスキルを身につけると簡単になります。/
4.Making omelettes isn 't difficult,but there 's a knack to it.