en

Be off (one's) guard

ru

Перевод слова "be off (one's) guard" на Русский язык

be off (one's) guard
быть не начеку
He was caught off his guard by the sudden question.
Он был застигнут врасплох внезапным вопросом.

Опеределения

To be unprepared, inattentive, or not alert to potential danger, threats, or surprises; to not be paying close attention or to have one's defenses lowered.