Green’s Dictionary of Slang

dab v.1

[dab n.2 (3)]

1. (UK Und./police) to take a suspect’s fingerprints.

[UK]V. Davis Phenomena in Crime 36: Have you been mugged and dabbed?
[UK]J. Cameron Hell on Hoe Street 170: Forensics all over the shop. They even dabbed for fingerprints.

2. see dub v.1

SE in slang uses

In phrases

dab out (v.) [SE dab, to strike or cause to strike (usu. with something soft and of broadish surface); thus the slapping of clothes on a washboard etc.]

to do the laundry; to wash.

[UK]S. Watson Wops the Waif 8/2: I’ve ‘dabbed’ out myself and made myself as clean as I can.
[UK]Barrère & Leland Dict. of Sl., Jargon and Cant.
dab the paint (v.)

in boxing, to jab with the fist.

[UK]A. Mayhew Paved with Gold 189: The return blow came quick as a racer’s kick and ‘dabbed the paint’ about the giant’s ‘meat-mincer,’ making the lip rise like balm.