1. based on the negative characteristics of the dog, synon. with dog n.2 (1)
(a) [mid-18C+] an unpleasant person.
(b) [mid-19C+] a gangster, a hoodlum.
(c) [1920s+] (US black) an indiscriminatingly promiscuous man.
(d) [1930s+] (Aus.) a lazy, good-for-nothing person.
(e) [1960s] (US) a coward.
(f) [1980s+] (Aus. prison) an informer.
(g) [1980s+] an unattractive woman.
2. [1910s+] (US) an enthusiast, a devotee [-hound sfx].
3. [1950s+] (US black) a Greyhound Corporation bus.
4. [1960s] (US) ‘the daylights’, ‘the stuffing’; thus kick/knock the hound out of.
[1970s] (Irish) to deceive, to trick.