تغفَّلَ يتغفَّل، تَغَفُّلاً، فهو مُتَغَفِّل، والمفعول مُتَغَفَّل

تحيَّن غفلتَه، أي سهوه عن الشّيء وعدم تيقّظه.

🇬🇧 Translation:

The child watched for the opportunity of his father's inattention, i.e., his heedlessness of something and lack of alertness.