1 B1 慣用的 カジュアル
特に座っているときや、起きているべき場面で、うっかり眠ってしまう。
"The lecture was so dull that half the class nodded off within the first ten minutes."
“
I was nodding off in front of the fire.
— A.A. Milne, 'Winnie-the-Pooh' style narrative — widely paraphrased; actual common literary phrasing found in numerous British texts of this period