1. [late 17C+] the female genital area.
2. [mid-19C+] (US) the mouth; often as shut pan!
3. [1910s] the head.
4. [1910s+] the human face.
5. [1970s+] (US gay) the anus.
[late 18C–1920s] be quiet! shut up!
SE in slang uses
[1940s] (W.I.) a district constable.
see dishlicker under dish n.1
[1990s+] (UK juv.) a fool.
[1940s] (US) a cook.
see under down prep.
[1930s–60s] (US) in difficulties, facing problems.
see down the pan under down prep.