tosher

1. (historical, cant) A thief who steals the copper siding from the bottoms of vessels, particularly in or along the Thames.Examples: "Toshers, men who steal copper from ships' bottoms in the Thames."historical

2. (chiefly historical) A scavenger of valuables lost in the sewers, particularly those of London during the Victorian Age.Examples: "The sewer-hunters were formerly, and indeed are still, called by the name of ‘Toshers’, the articles which they pick up in the course of their wanderings along shore being known among themselves by the general term ‘tosh’, a word more particularly applied by them to anything made of copper."historical