noun, noun or participle which takes 'suru', intransitive verb
negligence; carelessness; inattention; unpreparedness
Refers to letting one's guard down, failing to pay attention, or being unprepared, often leading to a negative outcome. Commonly used in warnings and proverbs.
油断すると事故につながる。
A moment's carelessness can lead to an accident.
彼
He let his guard down and had his wallet stolen.
油断大敵。
Unpreparedness is one's greatest enemy. (proverb)