During his life, he put a frame, which had a word "Yudan" (be offone'sguard or inattention) on a wall, and always told his family "The only thing people should do is not to lose his sharpness."
生前、「油断」と書いた額をかけておき、家人に「人は只、油断の二字を戒むべきである。」と言っていた。 - Wikipedia日英京都関連文書対訳コーパス
Even if the opponent seems to have lost fighting power completely, it can be camouflage, and the opponent may return the attack by taking advantage of one's being offguard.
たとえ相手が完全に戦闘力を失ったかのように見えてもそれは擬態である可能性もあり、油断した隙を突いて反撃が来ることが有り得る。 - Wikipedia日英京都関連文書対訳コーパス
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