Green’s Dictionary of Slang

nap v.2

[dial. knap]

1. to break, to hit with a hammer.

[UK]Hotten Sl. Dict.
[UK]Sl. Dict.
[UK]E.J. Milliken ’Arry Ballads 21: He napped me.
[Aus]Truth (Brisbane) 10 Apr. 5/2: [A] kindly Government [...] provided him soft stones to nap.

2. (Irish) to knock softly.

[Ire]Share Slanguage.