Green’s Dictionary of Slang

blowen n.

also bloan
[according to George Borrow f. Rom. beluñi, ‘a sister in debauchery’. Hotten (1867) notes Ger. Bluhen, bloom, and Buhlen, sweetheart, but adds ‘the street term ... may mean one whose reputation has been ‘blown on’, or damaged’]

1. [late 17C+] a woman, spec. a prostitute.

2. [late 18C] as blowen of the ken, a landlady, a ‘mistress of the house’.

3. [late 18C–early 19C] (UK Und.) the pretended wife of a shoplifter.

4. [mid-19C] a mistress.