Refers to a careless mistake or failure to notice something important. Often used in negative expressions like 抜かりなく (without oversight) or 抜かりはない (there is no oversight).
There is no oversight in the preparations.
抜かりなく手配を進めてください。
Please proceed with the arrangements without any slip-ups.
Standard kanji spelling.
Kana spelling is common in everyday writing.
Derived from the verb 抜かる (ぬかる, 'to make a blunder' or 'to be careless'), which itself comes from 抜く (ぬく, 'to pull out' or 'to omit') with the sense of 'missing something'.