Green’s Dictionary of Slang

maunder v.

also mander
[maund v.]

1. [17C–18C] to beg; thus maunder on the fly, to beg in the streets; maundering, begging, prone to begging; maundering tools, items used to enhance one’s begging image and thus gain more sympathy and alms.

2. [mid-19C] (UK und.) writing begging letters, counterfeit documents, etc.

In phrases

maundering lay (n.) [lay n.3 (1)]

[mid-19C] (UK Und.) begging (under false pretences).