The all [fabled] [nod] of acknowledgement is an interesting phenomenon. It is, put simply a slight head nod exchanged between males. While its use is documented among females, it is a rare and condition specific phenomenon. While exchanged between friends who, for whatever reason may not want to acknowledge each other verbally, in some places of the world, it is a common greeting among strangers. For example, in the southern United States, it is very common to offer a head nod to another male as you pass each other or get caught glancing at each other. However, as you travel further north, the head nod [disappears] among unfamiliars. While taking [a stroll] in NYC, youd be hard pressed to get any unfamiliar male to return a nod of acknowledgement while simply walking down the street.
Nod off
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