ETYMOLOGY
from nab (one who nabs, a police officer (slang)) + man
EXAMPLE
“… Gold. Ah! It’s all up with poor Jack, he’s fixed at last.
Sil. What do you mean?
Gold. Old Dornton has sent the Nab man after him!
Sil And arrested him?
Gold. Yes he’s touched! …”
From: The Road to Ruin: A Comedy
By Thomas Holcroft, 1792
Lexicophilia 