Wordnet 3.0
NOUN (1)
1.
an informal term for a British policeman;
The Collaborative International Dictionary of English v.0.48:
Bobby \Bob"by\, n.
A nickname for a British policeman; -- from Sir Robert Peel,
who remodeled the police force. See Peeler. [Slang, Eng.]
--Dickens.
[1913 Webster]
WordNet (r) 3.0 (2006):
bobby
n 1: an informal term for a British policeman
Moby Thesaurus II by Grady Ward, 1.0:
21 Moby Thesaurus words for "bobby":
Dogberry, John Law, bluebottle, bluecoat, bull, constable, cop,
copper, dick, flatfoot, flattie, gendarme, gumshoe, officer, paddy,
peeler, pig, shamus, the cops, the fuzz, the law