1. [late 16C+] (also trading) prostitution, sexual intercourse.
2. [1920s+] a prostitute’s client.
3. [1910s+] (gay) a man with whom one has (commercial) sex, a male prostitute; a male prostitute’s customer; thus piece of trade under piece n.
4. [1940s] one who works as a prostitute.
[1940s+] (gay) to perform fellatio without reciprocation; note gay trade under gay adj.
[1940s+] (Can./US) to have sexual intercourse as the ‘price’ of taking a woman out.