📒 if you nod, nod your head or your head nods, you move your head up and down to show agreement, understanding, etc.
📒 to move your head down and up once to say hello or goodbye to somebody or to give them a sign to do something
📒 to move your head in the direction of somebody/something to show that you are talking about them/it
📒 to let your head fall forward when you are sleeping in a chair
📒 to only know somebody/something slightly