Quiz: Remember the definition of mal de mer?
"back of the neck," c.1300, of unknown origin, perhaps from Old French hanap "a goblet," in reference to the hollow at the base of the skull. "The entire absence of forms with initial k makes it difficult to connect the word with the apparently synonymous OFris (hals) knap [OED].
nape (nāp, nāp)
The back of the neck.