油ゆ断だん大たい敵てき

expression

don't let your guard down; carelessness is the great enemy

A yojijukugo proverb warning that letting your guard down is the greatest danger; used as a standalone admonition or in cautionary contexts.

• 油ゆ断だん大たい敵てき、最さい後ごまで気きを抜ぬくな。

  Don't let your guard down—stay focused until the very end.

• 試し験けんが終おわるまで油ゆ断だん大たい敵てきだ。

  Until the exam is over, carelessness is the great enemy.