Green’s Dictionary of Slang

bearer-up n.

[bear up v.; K. Chesney, in Victorian Underworld (1970) suggests a ‘bully who robs men decoyed by a woman accomplice’ but no Dict. supports this definition]

1. a decoy who induces victims to play with card cheats.

[UK]Sl. Dict.
[UK]Barrère & Leland Dict. of Sl., Jargon and Cant I 93/2: Bearer-up (thieves’ slang), a gambling-cheat, more generally called a ‘bonnet,’ [...] a decoy-duck at cards who induces strangers to play with sharpers by persuasion or seeing him win.
[UK]Farmer & Henley Sl. and Its Analogues.

2. (UK Und.) a pimp who robs his prostitute’s client.

[UK]W. Newton Secrets of Tramp Life Revealed 21: They go as man and wife [...] He will then force her, if she requires any forcing, out at night to pick up something; it makes no difference to him how she gets it, whether by stealing or by going with other men [..] Now if both these people are out together, he is what they term a ‘bearer-up’ [...] they will both tackle and rob him.