Eaves-droppers 'are such as listen under walls or windows, or the eaves of houses, to hearken after discourse, and thereupon to frame slanderous or mischievous tales' (Blackstone). Such persons are, by the law of England, regarded as common nuisances, and are punishable by fine.
Eaves-droppers
Chambers's Encyclopaedia, Volume 4: Dionysius to Friction, p. 177
Source scan(s): p. 0186