Green’s Dictionary of Slang

nipper n.1

[nip v.1 ]

1. [late 16C–19C] (UK Und., also nypper) a cutpurse or pickpocket.

2. [mid-19C–1900s] (US/Aus.) a thief or swindler.

3. [mid–late 19C] (US) a policeman.

4. [late 19C] a miser, a tight-fisted person.