Definition of head-nodding in US English:

head-nodding

adjective

  • 1Engaged in nodding the head, especially to express assent or with drowsiness; characterized by such nodding of the head.

  • 2Designating an appealing or gentle musical rhythm to which one might nod one's head; designating a piece of music having such a rhythm.

Origin

Mid 19th century. From head + nodding.

Pronunciation

head-nodding

/ˈhɛdˌnɒdɪŋ/