[1990s+] (US prison) a belt with a sharpened buckle, used as an offensive weapon.
SE in slang uses
see separate entry.
[1940s+] (US) to get into bad trouble, physical or otherwise (cf. put someone’s ass in a sling ).
[late 19C+] to be depressed, crushed, defeated; thus put someone’s eye in a sling v., to depress someone; with one’s eye in a sling, depressed, crushed, defeated .
[1940s–60s] (orig. US black) to be defeated or depressed.
[1990s+] to have someone at one’s mercy, lit. or fig.
[1940s–60s] (US) in difficulties.
[1940s+] (US) to cause trouble for.