Green’s Dictionary of Slang

sold out adj.1

also sold up

1. bankrupt.

[UK]Dickens ‘Slang’ in Household Words 24 Sept. 75/2: To say that a man is without money, or in poverty, some persons remark that he is down on his luck, hard up, stumped up, in Queer Street, under a cloud, up a tree, quisby, done up, sold up, in a fix.
[UK]Hotten Sl. Dict. 240: sold up, or out broken down, bankrupt.
[UK]Sl. Dict.

2. defeated, beaten.

[UK]Hotten Dict. of Modern Sl. etc.
[UK]Sl. Dict.
[US]R. Chandler ‘Blackmailers Don’t Shoot’ in Red Wind (1946) 91: You’re sold out.
[UK]V. Davis Gentlemen of the Broad Arrows 101: We’re sold out, Bill [...] Beaten on the post.