Green’s Dictionary of Slang

daub v.

also dawb
[? SE daub, to lay on thick; dial. daub, to flatter, to ‘butter up’, cf. SE phr. grease one’s palm]

to bribe.

[UK]Hickscorner Av: Ye knowe well there is crafte in daubynge I can loke in a mannes face and pycke his purse And tell newe tydynges it was neuer trewe.
[UK]J. Ray Proverbs 75: There is a craft in dawbing.
[UK]B.E. Dict. Canting Crew n.p.: Dawbing, bribing.
[UK]C. Johnson Hist. of Highwaymen &c. 68: A Justice [...] committed us to Goal; but here by our Artifices, and daubing the Jailers Hand with Perswasive, we obtained our Liberty.
[UK]Grose Classical Dict. of the Vulgar Tongue n.p.: Dawb, to dawb, to bribe; the cull was scragged because he could not dawb, the rogue was hanged because he could not bribe.
[UK]Lex. Balatronicum.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.
[US]Matsell Vocabulum.