cabecear
nod
cabeza
head
+
-ear
verb suffix
Cabecear means to nod and can be thought of as cabeza0 (head0) + -ear1 (verb suffix1), literally meaning 'to do something with the head'.
verb
- nodTo nod or move the head up and down.El estudiante cabeceaba mientras escuchaba la lección. // The student was nodding while listening to the lesson.