noun
oversight; gap; careless mistake
Almost always used in the negative phrase 抜け目がない, meaning 'shrewd', 'calculating', or 'leaving no loophole'. Rarely used independently.
See also: 抜け目がない
彼は抜け目がないから、契約書の細かい字も必ず読む。
He is shrewd, so he always reads the fine print in contracts.
That merchant is sharp and wouldn't agree to a discount.
Compound of 抜け (nuke, 'missing' or 'escaping') and 目 (me, 'eye' or 'point'), literally 'a missed point'. The exact historical derivation is uncertain, but it has long been used in the set phrase 抜け目がない.