プログレッシブ和英中辞典(第３版)の解説
かく【欠く】
1 〔損なう〕break; 〔一部を壊す〕chip
- 皿を欠く
chip a dish - 刃物を欠く
chip the blade of a knife／〔先端を〕break (off) the tip of a knife - 転んで前歯を欠いた
I fell down and broke a front tooth. - 氷を小さく欠く
chip ice
2 〔あるべきものがない〕lack
- 礼儀を欠く
lack good manners - 勇気を欠く
lack [((文))be wanting in] courage - 義理を欠く
fail to carry out one's duty [obligations] - あれは常識を欠く行動だった
His conduct was not entirely proper. - 彼の仕業だと断定するには決め手を欠く
We have no conclusive evidence to prove that he did it. - 全集の第3巻を欠く
The third volume of the set is missing. - 欠くべからざる
- 成功に欠くべからざる条件
conditions 「absolutely necessary [indispensable／essential] to [for] success