Definition of napper in English:

napper

Line breaks: nap¦per
Pronunciation: /ˈnapə
 
/

noun

British informal
  • A person’s head: a couple of shaven nappers
    More example sentences
    • When the Slovakian defender had cause to whack his napper at another careering ball, there was no doubt as to where it would end up.
    • Thinking laterally, on my feet, using my napper, I, armed with scant information and a hazy memory, embark on tracking FYCB down on the dating site myself.
    • Except he is not a man to allow his napper to reside in clouds, despite the club's fortunes taking off during his three-year stewardship.

Origin

late 18th century: from thieves' slang, of unknown origin.

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