an act of nodding:
The woman greeted us with a nod of the head.
I showed the doorman my card and he gave a friendly nod.
to give or be given permission to do something:
We're waiting for the boss to give us the nod on this one.
3 British English informal
by general agreement and without people discussing it:
The chairman's proposals are usually passed on the nod.
4 British English
used to tell someone that you have understood something, although it was said in an indirect way