kokunto
A single nod of the head, either in agreement or from drowsiness. A contained, deliberate downward motion of the head.
💡Used for a polite yes-nod, falling asleep and head drooping, or bowing briefly once.
先生の言葉にこくんとうなずいた。
I nodded once in agreement to what the teacher said.
He ___ nodded to confirm he understood.
わかったというように○○とうなずいた。