油断してはいけません。

油断してはいけません。

You'd better stay on your guard.

油断(ゆだん)してはいけません。

Yudanshite waikemasen.

油断 (ゆだん)

negligence; carelessness; inattention; unpreparedness

ば (ば)

if ... then; when; and; why don't you...?; the more (one does something); because; since

Readings: ユ、ユウ、あぶら

Meanings: oil, fat

Readings: ダン、た.つ、ことわ.る、さだ.める

Meanings: severance, decline, refuse, apologize, warn, dismiss, prohibit, decision, judgement, cutting