1. in physiological senses.
(a) [17C+] (also prickshaft) the penis [note blaxploitation films of the 1970s, starring macho private eye ‘John Shaft’].
(b) [1930s+] (US) a woman’s body, considered simply as a sexual object.
(c) [1920s–50s] (US) a (woman’s) leg.
2. [1910s+] (orig. US) unfair treatment; often as the shaft.
3. [1970s] (US) a single thrust of sexual intercourse.
[2000s] an example of unfair treatment.
[1970s] a cheat, a deceiver.
to be treated unfairly or harshly.
[mid-18C] the penis.
see under sink v.