verb
nods; nodded; nodding
to move your head up and down as a way of answering yes or of showing agreement, understanding, or approval [no obj]
to move your head up and down as a signal to someone or as a way of saying hello or goodbye to someone [no obj] - often + to
always followed by an adverb or preposition [no obj] :to slightly move your head in a specified direction
[no obj] :to move up and down
nod off
[phrasal verb] informal :to fall asleep
noun
plural nods
[count] :a movement of your head up and down especially as a way of answering yes or of showing agreement, understanding, or approval :an act of nodding
[singular] somewhat informal :something done to show that someone or something has been chosen, approved, etc.
on the nod
Brit informal :by general agreement and without discussion
US