頷く

(1)lower and raise the head, as to indicate assent or agreement or confirmation; "The teacher nodded when the student gave the right answer"

(2)同意、意見の一致または確認を示すことなどのために頭を下げたり上げたりする

(3)express or signify by nodding; "He nodded his approval"

(4)うなずくことによって、表すか、意味する

(1)