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nod2
1 [countable] an act of nodding : 
The woman greeted us with a nod of the head.
The woman greeted us with a nod of the head.2 to give or be given permission to do something : We're waiting for the boss to give us the nod on this one.
give somebody the nod/get the nod from somebody
informalWe're waiting for the boss to give us the nod on this one.3 by general agreement and without people discussing it : The chairman's proposals are usually passed on the nod.
on the nod
British English informalThe chairman's proposals are usually passed on the nod.4 used to tell someone that you have understood something, although it was said in an indirect way
