nodnodnodsnoddednoddingverb (nods, nodding, nodded)to move your head down and up again quickly as a way of saying ‘yes’ or ‘hello’ to somebody: ‘Do you understand?’ asked the teacher, and everybody nodded.nod offto go to sleep: Grandma nodded off in her chair.▶ nodnoun: Jim gave me a nod when I arrived.