1.
carelessness is one's greatest enemy, overconfidence is dangerous
A warning that letting one's guard down or becoming complacent can lead to failure.
油断大敵だから、気を引き締めよう。
Carelessness is the enemy, so let's stay focused.
試合は最後まで油断大敵だ。
In a match, you can't let your guard down until the end.
合格したと思っても油断大敵だよ。
Even if you think you passed, don't get overconfident.
FOUR-CHARACTER IDIOM (四字熟語):
油断 means "carelessness" or "letting one's guard down," and 大敵 means "great enemy." This is a common proverb warning against complacency.
USAGE:
- Often used as a reminder to stay vigilant
- Common in sports, work, and study contexts