Green’s Dictionary of Slang

nap v.1

[nab v.1 or related to Swedish/Norwegian nappa or Danish nappe, to snatch, snap; cf. knap v.]

1. [mid-17C–early 19C] (UK Und., also nap on) to cheat at dice.

2. [late 17C–1950s] to steal.

3. [late 17C–mid-18C] to take into custody.

4. [late 17C–late 18C] to consume.

5. [late 17C–19C] to suffer punishment; to receive a blow.

6. [mid-18C–19C] (also nap on) to seize, to catch, to lay hold of (a person or thing).

In phrases

nap a winder (v.) (also nap the winder) [winder n.1 ]

1. [early–mid-19C] (also knap a winder, nap the winding post) to be transported for life.

2. [early–mid-19C] to be hanged.

3. [mid-19C–1930s] to receive an unpleasant shock.

nap it (v.) (also knap it)

[late 17C–early 19C] to receive severe punishment, esp. in a boxing-match.

nap it at the nask (v.) [nask n.]

[late 17C–early 18C] to receive a judicial flogging at Bridewell.

nap one’s bib (v.) (also nab one’s bib, nab the bib, nap..., nob...) [nap v.1 /nab v.1 + SE bib, to weep]

[late 18C–mid-19C] to weep, esp. for effect, i.e. to get one’s way, to put across one’s point.

nap the pad (v.) [pad n.2 (1)]

[mid-18C] (UK Und.) to go to bed.